Scripting a 4-Color Multiple Grepper
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I wrote the shell script described here ('grep4') to find up to four items at the same time in my data tables, which are big text files with one record per line. The script gives each searched-for item its own color on the terminal screen. It lets me know in advance how many 'hits' there are, so that if there are lots of hits, I get the choice of printing the results to a file instead of displaying them. The script also lets me choose between seeing all records with any of the items (the OR case: A or B or...) or just the records containing all the searched-for items on one line (the AND case: A and B and...).
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