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→INVESTIGATION 3: OTHER COMMANDS USING REGULAR EXPRESSIONS
# 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;">less 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 throughout the second line at the top.<br><br>#Search for the next occurrence of the pattern '''uli101''' by '''re-typing'''<br>the following regular expression and pressing ENTER:<br><span style="color:blue;font-weight:bold;font-family:courier;">/uli101</span><br><br>you should now see the '''second occurrence''' of this pattern near the toptext file.<br><br>
# Press the letter <span style="color:blue;font-weight:bold;font-family:courier;">q</span> to exit the '''more''' command.<br><br>
# Try the same search techniques with the '''lessmore''' command.<br><br>Does it work the same for the ''less'' command as it did for the ''more'' command?<br><br>[[Image:other-re-3.png|thumb|right|300px|Entering '''/uli101''' in the '''vi''' command can search for the string "'''uli101'''".]]
#Let's learn how to perform a simple '''search and replace''' within the '''vi''' utility by using regular expressions.<br>Issue the following Linux command to edit the '''large-file.txt''' file:<br><span style="color:blue;font-weight:bold;font-family:courier;">vi large-file.txt</span><br><br>Let's first perform a simple search within this text file.<br><br>
# Press the '''ESC''' key to make certain you are in '''COMMAND''' mode.<br><br>
