Changes

=INTRODUCTION TO SHELL SCRIPTINGUSING SED & AWK UTILTIES=

:* Understand Use the process for planning prior '''sed''' command to writing '''manipulate text''' contained in a shell scriptfile.

:* Understand List and explain several '''addresses''' and '''instructions''' associated with the purpose of a she-bang line contained at the top of a shell script'''sed''' command.

:* Setting permissions for Use the '''sed''' command as a shell script and properly execute a shell script'''filter''' with Linux pipeline commands.

:* Understand and use environment and user-defined variables within Use the '''awk''' command to '''manipulate text''' contained in a shell scriptfile.

:* Understand List and explain '''comparison operators''', '''variables''' and '''actions''' associated with the purpose of control flow statements used with shell scripts'''awk''' command.

:* Use the test '''awk''' command to test various conditionsas a '''filter''' with Linux pipeline commands. :* Use the if logic statement and the for loop statement within shell scripts.<br><br>

|colspan="2" |Course Notes'''Slides''':<ul><li>Week 11 Lecture 1 Notes:<br> [[Media:ULI101-Week11.1.pdf | PDF]] | [https://ictmatrix.senecacollege.ca/~murraychris.sauljohnson/uli101ULI101/ULI101-Week11.1.pptx PPTX]</li><li>Week 11 Lecture 2 Notes:<br> [[Media:ULI101-Week10Week11.2.pdf | PDF]] | [https://ictmatrix.senecacollege.ca/~murrayjason.saulcarman/uli101slides/ULI101-Week10Week11.2.pptx PPTX]<br></li></ul> 

| style="padding-left:15px;" |Shell Scripting'''Commands:'''* [https://searchdatacenter.techtargetman7.comorg/definitionlinux/shellman-script Purpose]* [https:pages/man1/wwwsed.youtube1p.com/watch?v=cQepf9fY6cE Creating and Running a Shell Scripthtml sed]<br>Variables* [https://opensourceman7.comorg/articlelinux/19/8/what-are-environmentman-variables Environment]* [https:pages/man1/www.linuxtechiawk.com/variables-in-shell-scripting/#:~:text=User%20Defined%20Variables%3A,like%20a%20real%20computer%20program1p. User Definedhtml awk]

|colspan="1" style="padding-left:15px;" width="30%"|'''Brauer Instructional Videos:'''<ul><li>[https://www.youtube.com/watch?v=kxEP-KUhOSgnpU6S61AIko&list=PLU1b1f-2Oe90TuYfifnWulINjMv_Wr16N&index=5 Introduction to Shell Scripting14 Using the sed Utility]</li><li>[https://www.youtube.com/watch?v=XVTwbINXnk4OV3XzjDYgJo&list=PLU1b1f-2Oe90TuYfifnWulINjMv_Wr16N&index=6 13 Using Variables and Control Flow Statements in Shell Scriptingthe awk Utility]</ul>

[[Image:ipso.png|thumb|right|500px|An IPSO Diagram (INPUT, PROCESSING, STORAGE, OUTPUT) can be used to map-out and then list the sequence of steps to assist when coding your shell script.]]It is recommended to '''plan''' out on a piece of paper the purpose of the shell script.<br>You can do this by creating a simple '''IPSO''' diagram (stands for '''INPUT''', '''PROCESSING''', '''STORAGE''', '''OUTPUTUsage:''').

'''Using a Shebang LineHow it Works:'''

[[Image:shebang.png|thumb|right|200px|* The '''shebang line''' <u>must</u> appear on sed command reads all lines in the '''first line''' and at input file and will be exposed to the '''beginning''' of the shell script.]]If you are learning Bash scripting by reading other people’s code you might have noticedexpression<br>that the first (i.e. area contained within quotes) one line in the scripts starts with the #! characters and the path to the Bash interpreterat a time.* The expression can be within single quotes or double quotes.This sequence of characters * The expression contains an address (match condition) and an instruction (#!operation) is called '''shebang''' and is used to tell the operating system<br>which interpreter to use to parse the rest of the file. Reference: https://linuxize.com/post/bash-shebang/ The '''shebang line''' <u>must</u> appear on * If the '''first line''' and at the '''beginning''' of the shell script,<br>otherwisematches the address, then it will be treated as a regular comment and ignoredperform the instruction. * Lines will display be default unless the '''Setting Permissions &amp; Running a Shell Script–n'''option is used to suppress default display To run your shell script by name, you need to assign execute permissions for the user.<br>To run the shell script, you can execute it using a relative, absolute, or relative-to-home pathname '''ExampleAddress:<br><br><span style="font-family:courier;">chmod u+x myscript.bash<br>./myscript.bash<br>/home/username/myscript.bash<br>~/myscript.bash</span>'''

[[Image:sed.png|right|500px|]]'''VariablesInstruction:''' are used to *'''store informationAction''' to be referenced and manipulated in a computer program.<br>They also provide a way take for matched line(s)*Refer to table on right-side for list of labeling data with a descriptive name, so our programs can be understood<br>more clearly by the reader and ourselves.some<br>'''Reference:common instructions''' https://launchschool.com/books/ruby/read/variablesand their purpose<br><br>

 '''Environment Variables''' [[Image:environment.png|thumb|right|500px|Examples of using '''Environment''' and '''User Defined''' variables.]]Shell environment variables shape the working environment whenever you are logged in Common shell. Some of these variables are displayed via Linux commands in the diagram displayed on the right-side.<br>(you can issue the pipeline command '''set | more''' to view all variables) Placing a dollar sign ('''$''') prior to the variable name will cause the variable to expand to the value contained in the variable.  '''User Defined Variables''' '''User-defined variables''' are variables which can be '''created by the user''' and exist in the session. This means that no one can access user-defined variables that have been set by another user,<br>and when the session is closed these variables expire.<br>'''Reference:''' https://mariadb.com/kb/en/user-defined-variables/ Data can be stored and removed within a variable using an equal sign.<br>The '''read''' command can be used to prompt the user to enter data into a variable.<br>Refer to the diagram on the right-side to see how user-defined variables are assigned data. '''Positional Parameters and Special Parameters''' [[Image:positional.png|thumb|right|220px|Examples of using '''positional''' and '''special''' parameters.]]A '''positional parameter''' is a variable within a shell program; its value is set from an argument specified on the command line that invokes the program.Positional parameters are numbered and are referred to with a preceding "'''$'''": '''$1''', '''$2''', '''$3''', and so on. The positional parameter $0 refers to either the name of shell where command was issued, or name of shell script being executed. If using '''positional parameters''' greater than '''9''', then you need to include number within braces.<br>Examples: '''echo ${10}''', '''ls ${23}''' The '''shift''' command can be used with positional parameters to shift positional parameters<br>to the left by one or more positions. There are a few ways to assign values as positional parameters::*Use the '''set''' command with the values as argument after the set command:*Run a shell script containing arguments   There are a group of '''special parameters''' that can be used for shell scripting.<br>A few of these special parameters and their purpose are displayed below:<br>'''$*''' , '''“$*”''' , '''"$@"''' , '''$#''' , '''$?''' Refer to the diagram to the right for examples using positional and special parameters. ===Using Control Flow Statements in Shell Scriptsthe awk Utility===

The special parameter '''$?Usage:''' Is used to determine the exit status of the previously issued Linux command.The exit status will either display a zero (representing TRUE) or a non-zero number (representing FALSE). This can be used to determined if a Linux command was correctly or incorrectly executed.

The <span style="color:blue;font-weight:bold;font-family:courier;">awk [-F] '''test''' Linux command is used to test conditions to see if they are '''TRUE''' (i.e. value '''zero''') or '''FALSE''' (i.e. value '''nonselection-criteria {action}’ file-zero''') so they can be used with control flow statements to control the sequence of a shell script.name</span>

Refer * The '''awk''' command reads all lines in the input file and will be exposed to diagrams the expression (contained within quotes) for processing.*The '''expression''' (contained in quotes) represents '''selection criteria''', and '''action''' to execute contained within braces '''{}'''* if selection criteria is matched, then action (between braces) is executed.* The '''–F''' option can be used to specify the right involving the test commanddefault '''field delimiter''' (separator) character<br>eg. '''awk –F”;”''' (would indicate a semi-colon delimited input file).<br>'''Selection Criteria'''

* You can use a regular expression, enclosed within slashes, as a pattern. For example: '''Logic Statements/pattern/'''* The ~ operator tests whether a field or variable matches a regular expression. For example: '''$1 ~ /^[0-9]/'''A * The '''!~''' operator tests for no match. For example: '''$2 !~ /line/'''* You can perform both numeric and string comparisons using relational operators ( '''>''' , '''logic statement>=''' , ''' is used to determine which Linux commands to be executed based<br>on ''' , '''<=''' , '''==''' , '''!=''' ).* You can combine any of the patterns using the result of a condition Boolean operators '''||''' (OR) and '''&&''' (iAND).e. TRUE * You can use built-in variables (zero valuelike NR or "record number" representing line number) or FALSE with comparison operators.<br>For example: '''NR >=1 && NR <= 5''' <br>'''Action (non-zero valueexecution)).:'''

<table align="right"><tr valign="top"><td>[[Image:logic-1* Action to be executed is contained within braces '''{}'''* The '''print''' command can be used to display text (fields).png|thumb|right|250px|Example * You can use parameters which represent fields within records (lines) within the expression of using the awk utility.* The parameter '''if$0''' logic control-flow statementrepresents all of the fields contained in the record (line).]]</td><td>[[Image:loop-* The parameters '''$1''', '''$2''', '''$3''' … '''$9''' represent the first, second and third to the 9th fields contained within the record.png|thumb|right|250px|Example * Parameters greater than nine requires the value of using the parameter to be placed within braces (for example: '''for${10}''','''${11}''','''${12}''' looping control, etc.)* You can use built-flow statement.]]in '''variables''' (such as '''NR''' or "record number" representing line number)</td></tablebr>eg. '''{print NR,$0}''' (will print record number, then entire record).

There are several logic statements, but we will just concentrate on the if statement.<pre style="widthINVESTIGATION 1:20%">if test condition then command(s) fi</pre>USING THE SED UTILITY=

Refer <span style="color:red;">'''ATTENTION''': Effective '''May 9, 2022''' - this online tutorial will be required to the diagram relating be completed by '''Friday in week 11 by midnight'''<br>to logic statements on the right side for an example.obtain a grade of '''2%''' towards this course</span><br><br>

'''Loop Statements''' A '''loop statement''' is a series of steps or sequence of statements executed repeatedly zero or more times satisfying the given condition is satisfied.<br>Reference: https://www.chegg.com/homework-help/definitions/loop-statement-3 There are several loops, but we will look at the for loop using a list. <pre style="width:20%">for item in list do command(s) done</pre> Refer to the diagram relating to looping statements on the right side for an example. =INVESTIGATION 1: CREATING A SHELL SCRIPT= <br>In this sectioninvestigation, you will learn how to create and run a simple Bash Shell scriptmanipulate text using the '''sed''' utility.

# '''Login''' to your matrix accountand confirm you are located in your '''home''' directory.<br><br># Issue a Linux command to create a directory called '''sed'''confirm<br><br># Issue a Linux command to <u>change</u> to the '''sed''' directory and confirm that you are located in your home the '''sed''' directory.<br><br># Issue the following Linux command to download the data.txt file<br>('''copy and paste''' to save time):<br><span style="color:blue;font-weight:bold;font-family:courier;">wget <nowiki>https://ict.senecacollege.ca/~murray.saul/uli101/data.txt</nowiki></span><br><br># Issue the '''more''' command to quickly view the contents of the '''data.txt''' file.<br>When finished, exit the more command by pressing the letter <span style="color:blue;font-weight:bold;font-family:courier;">q</span>[[Image:sed-1.png|thumb|right|300px|Issuing the '''p''' instruction without using the '''-n''' option (to suppress original output) will display lines twice.]]<br><br>The '''p''' instruction with the '''sed''' command is used to<br>'''print''' (i.e. ''display'') the contents of a text file.<br><br># Issue the following Linux command:<br><span style="color:blue;font-weight:bold;font-family:courier;">sed 'p' data.txt</span><br><br>'''NOTE: You should notice that each line appears twice'''.<br><br>The reason why standard output appears twice is that the sed command<br>(without the '''-n option''') displays all lines regardless of an address used.<br><br>We want will use '''pipeline commands''' to create both display stdout to the screen and save to files<br>for <u>confirmation</u> of running these pipeline commands when run a Bash Shell '''checking-script ''' later in this investigation.<br><br># Issue the following Linux pipeline command:<br><span style="color:blue;font-weight:bold;font-family:courier;">sed -n 'p' data.txt | tee sed-1.txt</span><br><br>What do you notice? You should see only one line.<br><br>You can specify an '''address''' to welcome display lines using the usersed utility<br>(eg. Let''line #'', '''line #s''' or range of '''line #s ''').<br><br># Issue the following Linux pipeline command:<br><span style="color:blue;font-weight:bold;font-family:courier;">sed -n '1 p' data.txt | tee sed-2.txt</span><br><br>You should see the first provide some useful tips line of the text file displayed.<br>What other command is used to only display the first line in terms a file?<br><br>[[Image:sed-2.png|thumb|right|500px|Using the sed command to display a '''range''' of selecting an appropriate name for lines.]]# Issue the following Linux pipeline command:<br><span style="color:blue;font-weight:bold;font-family:courier;">sed -n '2,5 p' data.txt | tee sed-3.txt</span><br><br>What is displayed? How would you modify the sed command to display the line range 10 to 50?<br><br>The '''s''' instruction is used to '''substitute''' text<br>(a similar to method was demonstrated in the shell scriptvi editor in tutorial 9).<br><br>#   In Issue the next investigationfollowing Linux pipeline command:<br><span style="color:blue;font-weight:bold;font-family:courier;">sed '2, 5 s/TUTORIAL/LESSON/g' data.txt | tee sed-4.txt | more</span><br><br>What do you will learn notice? View the original contents of lines 2 to create and run 5 in the '''data.txt''' file<br>in another shell scripts to confirm thatthe substitution occurred.<br><br>[[Image:sed-3.png|thumb|right|500px|Using the sed command with the '''-q''' option to display up to a line number, then quit.]]The '''q''' instruction terminates or '''quits''' the execution of the sed utility as soon as it is read in a particular line or matching pattern.<br><br># Issue the following Linux pipeline command:<br><span style="color:blue;font-weight:bold;font-family:courier;">sed '11 q' data.txt | tee sed-5.txt</span><br><br>What did you notice? How many lines were displayed<br>before the sed command exited?<br><br>You can use variables'''regular expressions''' to select lines that match a pattern. In fact, positional and special parameters<br>the sed command was one of the <u>first</u> Linux commands that used regular expression.<br><br>The rules remain the same for using regular expressions as demonstrated in '''tutorial 9'''<br>except the regular expression must be contained within '''forward slashes'''<br>(eg. <span style="font-family:courier;font-weight:bold;">/regexp/</span> ).<br><br>[[Image:sed-4.png|thumb|right|400px|Using the sed command using regular expressions with '''anchors'''.]]# Issue the following Linux pipeline command:<br><span style="color:blue;font-weight:bold;font-family:courier;">sed -n '/^The/ p' data.txt | tee sed-6.txt</span><br><br>What do you notice?<br><br># Issue the following Linux pipeline command:<br><span style="color:blue;font-weight:bold;font-family:courier;">sed -n '/d$/ p' data.txt | tee sed-7.txt</span><br><br>What do you notice?<br><br>The '''sed''' utility can also be used as a '''filter''' to manipulate text that<br>was generated from Linux commands.<br><br>[[Image:sed-5.png|thumb|right|400px|Using the sed command with '''pipeline''' commands.]]# Issue the following Linux pipeline command:<br><span style="color:blue;font-weight:bold;font-family:courier;">who | sed -n '/^[a-m]/ p' | tee sed-8.txt | more</span><br><br>What did you notice?<br><br># Issue the following Linux pipeline command:<br><span style=INVESTIGATION 2"color:blue;font-weight:bold;font-family:courier;">ls | sed -n '/txt$/ p' | tee sed-9.txt</span><br><br>What did you notice?<br><br># Issue the following to run a checking script: USING VARIABLES IN SHELL SCRIPTS <br><span style="color:blue;font-weight:bold;font-family:courier;">~uli101/week11-check-1</span><br><br>If you encounter errors, make corrections and '''re-run''' the checking script<br>until you receive a congratulations message, then you can proceed.<br><br>

:In this sectionthe next investigation, you will learn how to manipulate text using the '''awk''' utility...<br><br>

# xChange to your '''home''' directory and issue a command to '''confirm'''<br>you are located in your ''home'' directory.<br><br># Issue a Linux command to create a directory called '''awk'''<br><br># Issue a Linux command to <u>change</u> to the '''awk''' directory and confirm you are located in the '''awk''' directory.<br><br>Let's download a database file that contains information regarding classic cars.<br><br># Issue the following linux command ('''copy and paste''' to save time):<br><span style="color:blue;font-weight:bold;font-family:courier;">wget <nowiki>https://ict.senecacollege.ca/~murray.saul/uli101/cars.txt</nowiki></span><br><br># Issue the '''cat''' command to quickly view the contents of the '''cars.txt''' file.<br><br>The "'''print'''" action (command) is the <u>default</u> action of awk to print<br>all selected lines that match a '''pattern'''.<br><br>This '''action''' (contained in braces) can provide more options<br>such as printing '''specific fields''' of selected lines (or records) from a database.<br><br>[[Image:awk-1.png|thumb|right|400px|Using the awk command to display matches of the pattern '''ford'''.]]# Issue the following linux command all to display all lines (i.e. records) in the '''cars.txt''' database that matches the pattern (or "make") called '''ford''':<br><span style="color:blue;font-weight:bold;font-family:courier;">awk '/ford/ {print}' cars.txt</span><br><br>We will use '''pipeline commands''' to both display stdout to the screen and save to files for <u>confirmation</u> of running these pipeline commands when run a '''checking-script''' later in this investigation.<br><br># Issue the following linux pipeline command all to display records<br>in the '''cars.txt''' database that contain the pattern (i.e. make) '''ford''':<br><span style="color:blue;font-weight:bold;font-family:courier;">awk '/ford/' cars.txt | tee awk-1.txt</span><br><br>What do you notice? You should notice ALL lines displayed <u>without</u> using '''search criteria'''.<br><br>You can use ''builtin'' '''variables''' with the '''print''' command for further processing.<br>We will discuss the following variables in this tutorial:<br><br>[[Image:awk-2.png|thumb|right|400px|Using the awk command to print search results by '''field number'''.]]'''$0''' - Current record (entire line)<br>'''$1''' - First field in record<br>'''$n''' - nth field in record<br>'''NR''' - Record Number (order in database)<br> '''NF''' - Number of fields in current record<br><br>For a listing of more variables, please consult your course notes.<br><br># Issue the following linux pipeline command to display the '''model''', '''year''', '''quantity''' and price<br>in the '''cars.txt''' database for makes of '''chevy''':<br><span style="color:blue;font-weight:bold;font-family:courier;">awk '/chevy/ {print $2,$3,$4,$5}' cars.txt | tee awk-2.txt</span><br><br>Notice that a '''space''' is the delimiter for the fields that appear as standard output.<br><br>The '''tilde character''' '''~''' is used to search for a pattern or display standard output for a particular field.<br><br># Issue the following linux pipeline command to display all '''plymouths''' ('''plym''')<br>by '''model name''', '''price''' and '''quantity''':<br><span style="color:blue;font-weight:bold;font-family:courier;">awk '$1 ~ /plym/ {print $2,$3,$4,$5}' cars.txt | tee awk-3.txt</span><br><br>You can also use '''comparison operators''' to specify conditions for processing with matched patterns<br>when using the awk command. Since they are used WITHIN the awk expression,<br>they are not confused with redirection symbols<br><br>[[Image:awk-3.png|thumb|right|400px|Using the awk command to display results based on '''comparison operators'''.]]'''<''' &nbsp;&nbsp;&nbsp;&nbsp;Less than<br>'''<=''' &nbsp;&nbsp;Less than or equal<br>'''>''' &nbsp;&nbsp;&nbsp;&nbsp;Greater than<br>'''>=''' &nbsp;&nbsp;Greater than or equal<br>'''==''' &nbsp;&nbsp;Equal<br>'''!=''' &nbsp;&nbsp;&nbsp;Not equal<br><br># Issue the following linux pipeline command to display display the '''car make''', '''model''', '''quantity''' and '''price''' of all vehicles whose '''prices are less than $5,000''':<br><span style="color:blue;font-weight:bold;font-family:courier;">awk '$5 < 5000 {print $1,$2,$4,$5}' cars.txt | tee awk-4.txt</span><br><br>What do you notice?<br><br># Issue the following linux pipeline command to display display '''price''',<br>'''quantity''', '''model''' and '''car make''' of vehicles whose '''prices are less than $5,000''':<br><span style="color:blue;font-weight:bold;font-family:courier;">awk '$5 < 5000 {print $5,$4,$2,$1}' cars.txt | tee awk-5.txt</span><br><br># Issue the following linux pipeline command to display the '''car make''',<br>'''year''' and '''quantity''' of cars that '''begin''' with the '''letter 'f'''':<br><span style="color:blue;font-weight:bold;font-family:courier;">awk '$1 ~ /^f/ {print $1,$2,$4}' cars.txt | tee awk-6.txt</span><br><br>[[Image:awk-4.png|thumb|right|400px|Using the awk command to display combined search results based on '''compound operators'''.]]Combined pattern searches can be made<br>by using '''compound operator''' symbols:<br><br>'''&&''' &nbsp;&nbsp;&nbsp;&nbsp;(and)<br>'''||''' &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(or)<br><br># Issue the following linux pipeline command to list all '''fords'''<br>whose '''price is greater than $10,000''':<br><span style="color:blue;font-weight:bold;font-family:courier;">awk '$1 ~ /ford/ && $5 > 10000 {print $0}' cars.txt | tee awk-7.txt</span><br><br># Issue the following linux command ('''copy and paste''' to save time):<br><span style="color:blue;font-weight:bold;font-family:courier;">wget <nowiki>https://ict.senecacollege.ca/~murray.saul/uli101/cars2.txt</nowiki></span><br><br># Issue the '''cat''' command to quickly view the contents of the '''cars2.txt''' file.<br><br># Issue the following linux pipeline command to display the '''year'''<br>and '''quantity''' of cars that '''begin''' with the '''letter 'f'''' for the '''cars2.txt''' database:<br><span style="color:blue;font-weight:bold;font-family:courier;">awk '$1 ~ /^f/ {print $2,$4}' cars2.txt | tee awk-8.txt</span><br><br>What did you notice?<br><br>The problem is that the '''cars2.txt''' database separates each field by a semi-colon (''';''') <u>instead</u> of '''TAB'''.<br>Therefore, it does not recognize the second and fourth fields.<br><br>You need to issue awk with the -F option to indicate that this file's fields are separated (delimited) by a semi-colorn.<br><br># Issue the following linux pipeline command to display the '''year'''<br>and '''quantity''' of cars that '''begin''' with the '''letter 'f'''' for the '''cars2.txt''' database:<br><span style="color:blue;font-weight:bold;font-family:courier;">awk -F";" '$1 ~ /^f/ {print $2,$4}' cars2.txt | tee awk-9.txt</span><br><br>What did you notice this time?<br><br># Issue the following to run a checking script:<br><span style="color:blue;font-weight:bold;font-family:courier;">~uli101/week11-check-2</span><br><br>If you encounter errors, make corrections and '''re-run''' the checking script until you<br>receive a congratulations message, then you can proceed.<br><br>

In this section, you will learn how Here is a link to ...the MS Word Document of ALL of the questions displayed below but with extra room to answer on the document tosimulate a quiz:

The purpose of this section is to obtain Note the contents from the following tab-delimited file called '''extra practice~murray.saul/uli101/stuff.txt''' to help with '''quizzes''', your '''midterm''', and :(this file pathname exists for checking your '''final exam'''.work)

Here <pre>Line one.This is a link to the MS Word Document of ALL of second line.This is the questions displayed below but with extra room to answer on the document tothird.This is line four.Five.Line six followsFollowed by 7Now line 8and line nineFinally, line 10simulate a quiz:</pre>

Your instructor may take-up these questions during class. It is up to Write the student to attend classes in order to obtain results of each of the answers to following Linux commands for the following questions. Your instructor will NOT provide these answers in any other form (eg. eabove-mail, etc).mentioned file:

# <span style="font-family:courier;font-weight:bold">sed -n '3,6 p'~murray.saul/uli101/stuff.txt</span><br><br># <span style="font-family:courier;font-weight:bold">sed 'Review Questions4 q' ~murray.saul/uli101/stuff.txt</span><br><br># <span style="font-family:courier;font-weight:bold">sed '/the/ d'~murray.saul/uli101/stuff.txt</span><br><br># <span style="font-family:courier;font-weight:bold">sed 's/line/NUMBER/g'~murray.saul/uli101/stuff.txt</span>

'''PART APart B: WRITE BASH SHELL SCRIPT CODEWriting Linux Commands Using the sed Utility'''

'''Write a single Linux command to perform the answer to specified tasks for each question below the question in of the space providedfollowing questions.'''

# Write a Bash shell script that clears Linux sed command to display only lines 5 to 9 for the screen and displays the text Hello World on the screenfile: '''~murray.saul/uli101/stuff.<br><br><br><br><br>What permissions are required to run this Bash shell script?<br><br><br>What are the different ways that you can run this Bash shell script from the command line?<br>txt'''<br><br># Write a Bash shell script that clears Linux sed command to display only lines the screen, prompts begin the user pattern “and” for their '''full name''' and then prompts the user for their file: '''age~murray.saul/uli101/stuff.txt''',<br>then clears the screen again and welcomes the user by their name and tells them their age.<br> <br><br><br><br><br><br><br>What comments would you add # Write a Linux sed command to display only lines that end with a digit for the above script’s contents to properly document this Bash shell script to be understood<br>for those users that would read file: '''~murray.saul/uli101/ edit this Bash shell script’s contents?<br> stuff.txt'''<br><br># Write a Bash shell script Linux sed command to save lines that will first set match the pattern “line” (upper or lowercase) for the value of a variable called file: '''number~murray.saul/uli101/stuff.txt''' and save results (overwriting previous contents) to : '''23''' and make this variable '''read-only~/results.txt'''.<br>Then the script will clear the screen and prompt the user to enter a value for that variable called number to another value.<br>Have the script display the value of the variable called number to prove that it is a read-only variable.<br><br><br><br><br>When you ran this Bash shell script, did you encounter an error message?<br>How would you run this Bash shell script, so the error message was NOT displayed?<br><br><br># Write a Bash shell script that will clear the screen and then display all arguments that were entered after your Bash shell script when it was run. Also have the Bash shell script display the number of arguments that were entered after your Bash shell script.<br><br><br><br><br><br><br><br>

'''Write Part C: Writing Linux Commands Using the expected output from running each of the following Bash shell scripts You can assume that these Bash shell script files have execute permissions. Show your work.awk Utility'''

:Note the contents from the following tab-delimited file called '''Walkthru #1:~murray.saul/uli101/stuff.txt''':(this file pathname exists for checking your work)

#!/usr/bin/bashLine one.word1=”counter”This is the second line.word2=”clockwise”This is the third.echo “The combined word This is: $word2$word1”line four.Five.Line six followsFollowed by 7Now line 8and line nineFinally, line 10

Write a single Linux command to perform the specified tasks for each of the following questions.  # Write a Linux awk command to display all records for the file: '''~/cars''' whose fifth field is greater than 10000.<br><br># Write a Linux awk command to display the first and fourth fields for the file:'''Walkthru ~/cars''' whose fifth field begins with a number.<br><br>#2Write a Linux awk command to display the second and third fields for the file:'''~/cars''' for records that match the pattern “chevy”.<br><br># Write a Linux awk command to display the first and second fields for all the records contained in the file: '''~/cars'''<br><br>