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Tutorial9: Regular Expressions

1 byte added, 13 March
INVESTIGATION 3: OTHER COMMANDS USING 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''' 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, but '''most''' other Linux commands specify regular expressions using<br>'''forward slashes''' (e.g. <span style="font-weight:bold;font-family:courier;">/regular expression</span> &nbsp; or &nbsp; <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>
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