Discussion
Which option is used for ignoring case during pattern search in grep command ?
Answer: A
The option is -i.
grep -i pattern file ignores the difference between upper and lower case, so 'unix', 'Unix' and 'UNIX' all match.
-l lists only the names of the files containing a match, and -c prints the count of matching lines instead of the lines. -p is not a standard grep option.
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