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# Issue the following linux pipeline command to display '''two or more occurrences''' of the word "the":<br><span style="color:blue;font-weight:bold;font-family:courier;">egrep -i "(the){2,}" words.dat | tee word-search1.txt more</span><br><br>'''NOTE: No output is displayed! Why?'''<br><br>This is due to the fact that a <u>space</u> should be included at the end of the word "'''the'''".<br>Usually words are separated by spaces; therefore, there were no matches since there were not occurrences<br>of "thethe" as opposed to "'''the the'''" (i.e. no space after repetition of the pattern).<br><br>

# Reissue the previous pipeline command with the word the followed by a '''space''' within the brackets:<br><span style="color:blue;font-weight:bold;font-family:courier;">egrep -i "(the ){2,}" words.dat | tee word-search2.txt</span><br><br>[[Image:eregexps-3.png|thumb|right|330px|Using '''extended''' regular expression symbols (such as '''grouping''') to refine matches of repetition of '''words''' (as opposed to ''characters'').]]The <span style="font-weight:bold;font-family:courier;">"|"</span> (or) symbol (same symbol as "pipe") can be used within the grouping symbols to allow matching of additional groups of characters.<br>Again, it is important to follow the character groupings with the space character<br><br>

# Issue the following Linux command to check that you correctly issued<br>those ''Linux pipeline commands'' using the '''tee''' command to create those text files:<br><span style="color:blue;font-weight:bold;font-family:courier;">bash /home/murray.saul/myscripts/week9-check-3</span><br><br>If you encounter errors, then view the feedback to make corrections, and then re-run the checking script.<br>If you receive a congratulation message that there are no errors, then proceed with this tutorial.<br><br>Let's issue a Linux '''pipeline''' command using a combination of '''complex''' and '''extended''' regular expressions.<br><br>

# Issue the following Linux pipeline command:<br><span style="color:blue;font-weight:bold;font-family:courier;">ls | egrep "[a-z]{1,}.*[0-9]"</span><br><br>What did this Linux pipeline command display?<br><br>