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→INVESTIGATION 3: OTHER COMMANDS THAT USE REGULAR EXPRESSIONS
# Make certain that you are located in your '''~/regexps''' directory on your ''Matrix'' account.<br><br>
# Let's look at using regular expressions with the '''man''' command.<br>Issue the following linux command :<br><span style="color:blue;font-weight:bold;font-family:courier;">man ls</span><br><br>[[Image:other-re-1.png|thumb|right|300px|Entering '''/sort''' in the '''man, more and less commands ''' command can search for the string "'''sort'''".]]
# We want to search for an option that can sort the file listing.<br>Type the following regular expression below and press '''ENTER''':<br><span style="color:blue;font-weight:bold;font-family:courier;">/sort</span><br><br>'''FYI:''' The '''grep''' and '''egrep''' Linux commands contain the regular expressions within quotes,<br>but '''most''' other Linux commands specify regular expressions using forward slashes<br>(e.g. <span style="font-weight:bold;font-family:courier;">/regular expression</span> or <span style="font-weight:bold;font-family:courier;">/regular expression</span>).<br><br>
# Scroll throughout the man pages for the ls command to view matches for the pattern "'''sort'''"<br>(You can press '''SPACE''' or key combination '''alt-b''' to move forward and backwards one screen respectively).<br><br>
# Press the letter <span style="color:blue;font-weight:bold;font-family:courier;">q</span> to '''exit''' the ''man'' pages for '''ls'''.<br><br>Let's use regular expressions with the '''more''' command.<br><br>
# Issue the following Linux command to download another data file called '''large-file.txt''':<br><span style="color:blue;font-weight:bold;font-family:courier;">wget <nowiki>https://ict.senecacollege.ca/~murray.saul/uli101/large-file.txt</nowiki></span><br><br>
# View the contents of the '''large-file.txt''' file using the '''more''' command and quickly view the contents of this file.<br><br>[[Image:other-re-2.png|thumb|right|300px|Entering '''/uli101''' in the '''more''' and '''less''' commands can search for the string "'''uli101'''".]]
# Issue the following Linux command to view the contents of the '''large-file.txt''':<br><span style="color:blue;font-weight:bold;font-family:courier;">more large-file.txt</span><br><br>
#We want to search for a pattern '''uli101''' within this text file.<br>Type the following regular expression and press ENTER:<br><span style="color:blue;font-weight:bold;font-family:courier;">/uli101</span><br><br>You should see the pattern "uli101" on the second line at the top.<br><br>
