Changes

# To '''save''' your editing session, press: <span style="color:blue;font-weight:bold;font-family:courier;">&lt;ctrl&gt;&lt;x&gt;</span><br><br>

'''NOTE:''' Refer to the table below for a list of the most common '''vi''' ('''vim''') navigation &amp; editing commands:<br><table cellpadding="5"><tr><th style="border-bottom: 1px solid black;">Keyboard Combination</th><th style="border-bottom: 1px solid black;">Purpose</th></tr><tr><td>'''i'''</td><td>Enter '''INPUT''' mode</td></tr><tr><td>'''&lt;esc&gt;'''</td><td>Return to '''COMMAND''' MODE</td></tr><tr><td>'''W'''</td><td>Move forward one word</td></tr><tr><td>'''B'''</td><td>Move back one word</td></tr><tr><td>'''dd'''</td><td>Cut line</td></tr><tr><td>'''yy'''</td><td>Copy Line</td></tr><tr><td>'''&lt;ctrl&gt;u'''</td><td>Paste Cut/Copied Text</td></tr><tr><td>''':help'''</td><td>Display help screen ('':q!'' to exit help screen)</td></tr></table><br>

[[Image:vi-text-editor-2.png|right|350px250px|thumb|The online vi-tutorial provides users "hands-on" experience of using the vi text editor.]]

We conclude this tutorial by learning to use commands that manage the content contained instead text files whether it relate to '''viewingview''' or '''manipulatingmanipulate the <u>display</u>''' file contentwithout having to use a text editor.<br><br>This is HIGHLY ADVISED in case you only want to view contents and NOT edit file contents by mistake.

# View Refer to the following table of Text File Management commands Your instructor should have demonstrated in class how to use these commands):<br><br><table cellpadding="5"><tr><th style="border-bottom: 1px solid black;" width="20%">Linux Command</th><th style="border-bottom: 1px solid black;">Purpose</th></tr><tr><td>'''touch'''</td><td>Create empty file(s) / Updates Existing File's Date/Time Stamp</td></tr><tr><td>'''cat'''</td><td>Display text file's contents without editing (small files)</td></tr><tr><td>'''more , less'''</td><td>Display / Navigate within large text files without editing</td></tr><tr><td>'''cp'''</td><td>Copy text file(s)</td></tr><tr><td>'''mv'''</td><td>Move / Rename text files</td></tr><tr><td>'''rm'''</td><td>Remove text file(s)</td></tr><tr valign="top"><td>'''sort'''</td><td>Sorts (rearranges) order of file contents when displayed. Content is sorted alphabetically by default. The '''-n'''''Italic text'' option sorts numerically, '''-r''' performs a reverse sort</td></tr><tr valign="top"><td>'''head''' , '''tail'''</td><td>Displays the first / last 10 lines of a text file by default. An option using a value will display the number of lines (e.g. head -5 filename will display first 5 lines, tail -5 filename will display last 5 lines).</td></tr><tr valign="top"><td>'''grep'''</td><td>Displays file contents that match a pattern</td></tr><tr valign="top"><td>'''uniq'''</td><td>Displays identical consecutive lines only once</td></tr><tr valign="top"><td>'''diff''' file1 file2</td><td>Displays differences between 2 files</td></tr><tr><td>'''file'''</td><td>Gives info about the contents of the file (e.g. file with no extention)</td></tr><tr valign="top"><td>'''find'''</td><td>To find files matching specified characteristics:<table><tr valign="top"><td width="20%">'''find . -name "file*"'''</td><td>List pathname of any filenames beginning with "file",<br>from the current directory and any subdirectories</td></tr><tr valign="top"><td>'''find . -size +50k'''</td><td>List pathname of any files larger than 50 kb, from the current directory and any subdirectories</td></tr><tr valign="top"><td>'''find . -mmin -5''' </td><td>List files modified less than 5 minutes ago</td></tr><tr> valign="top"><td>'''find -P .'''</td><td>Lists file pathnames in the current directory</td></tr></table></td></tr></table><br><br>

# Use the '''nano''' text editor to edit the empty file called '''a.txt'''. <br><br>Type the number "'''1'''" and press '''ENTER'''. On the second line, type the number "'''2'''" and press '''ENTER'''. <br>Continue entering increasing number values until you reach the number '''40''' on line 40.<br><br>

# issue the following Linux command: <span style="color:blue;font-weight:bold;font-family:courier;">head - 7 a.txt</span><br><br>What is the output from this command display?<br><br>

# After you complete the Review Questions sections to get additional practice, then work on your <br>'''online assignment #1''',<br>'''section 2''' labelled "Basic Unix Commands" (parts '''4''' to '''6''') in this section which are respectively labelled: <br> '''Managing Files''' , '''Accessing Files''' and '''Review Exercise'''.<br><br>

[[Image:directorytree-structure-11diagram.png|right|350px|thumb|]]

# Write a Linux command to remove the '''concepts''' directory and prompt the user if they want to remove this directory’s contents.<br><br># Write a single Linux command to create the following empty files in the concepts directory:<br>'''myfile.txt'''<br>'''yourfile.txt'''<br>'''thefile.txt'''<br><br>

# Write a Linux command to sort the contents of a file called '''uli101practice/customers.txt'''# Write a Linux command to display the first 4 lines of a file called '''uli101practice/customers.txt'''# Write a Linux command to display the last line of a file called '''uli101practice/customers.txt'''# Write a Linux command to match a line containing the pattern '''Linux''' in a file called '''uli101practice/customers.txt'''# Write a Linux command to display unique occurrences of consecutive lines in a file called '''uli101practice/customers.txt'''