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OPS235 Lab 3

83 bytes added, 11:13, 10 February 2017

→‎Part 2: Compiling Source Code from a Downloaded Archived File

<li>Reissue the <code>./configure && make</code> command. Where you successful?</li>

<li>Run the command <code>lbreakout</code> (or possibly '''lbreakout2'''). Where you successful?</li>

<li>You need to run a command to make this program available regardless of your current directory (as opposed to running command in the directory that contains the program). Login as root (be sure to be in the same directory as the source code after logging in as root) and issue the command: <code>make install</code></li>

<li>Run the command: <code>lbreakout</code> . Did it work? Issue the command: <code>which lbreakout</code>. What do you think that the '''make install''' command did?</li>

</ol>

{{Admon/tip|Bash Shell Scripting Tips:| '''The Here Document''' <ul><li>A neat little trick involving a special type of redirection of stdin symbol: '''<<''' that allows input to be redirected to a command from within the command. </li><li>Examples: ''cat <<+ This is a test message This is the second line +'' ''mail -s "test message" youremailaddr <<+ This is a test message I hope you like it.'' + ''tr [a-z] [A-Z] <<+ i like ops235 i love scripting. +'' </li></ul>'''Using sed to Manipulate Text'''<ul><li>The Linux command '''sed''' stands for '''S'''treaming '''Ed'''itor which is an effective way to manipulate a text file, output sent from a command, or from within a "here document". This command can manipulate matching text on a variety of criteria (such as '''line number(s)''', '''regular expression match''', etc). Commands can then be used for manipulation such as '''omitting''', '''printing''', '''substituting''', '''adding''', and '''inserting''' text. </li><li>The sed option '''-n''' suppresses display of text so the print ('''p''') command can be used; otherwise, the text will be displayed (with edits via the sed command instructions). </li><li>Results of text manipulation with sed can be stored in a variable using command substitution, or redirected to a file. '''NEVER redirect the stdout from a sed command to the same input file (or the input file will be destroyed)!''' </li><li>Examples ''sed 's/|/ /g' <<+ I|like|weekends! +'' ''sed 's/$/\n/g' <<+ This text should be double-spaced!'' + </li></ul>}}

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===Part 3: Generating Sofware Package Information with Shell Scripts===

We will continue with using shell scripts to create a Software Information Report that manipulates output generated by the '''rpm''' command. The '''sed''' and '''awk''' commands are very useful tools in shell scripting to manipulate text. In this lab, we will be using ''sed'' to allow the user to select certain portions from the rpm command (options -qi).

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OPS235 Lab 3

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