INTERVIEW QUESTIONS OPERATING SYSTEMS UNIX COMMANDS DETAILS

Question: What is the use of ‘grep’ command?

Answer: ‘grep’ is a pattern search command. It searches for the pattern, specified in the command line with appropriate option, in a file(s).
Syntax : grep
Example : grep 99mx mcafile

‘grep’ is a pattern search command. It searches for the pattern, specified in the command line with appropriate option, in a file(s).
Syntax : grep
Example : grep 99mx mcafile Source: CoolInterview.com

grep word file
Here file is the name of a file in which you want to search for word. The grep command displays every line in file that contains word. When you specify more than one file, grep precedes each of the output lines with the name of the file that contains that line. Source: CoolInterview.com

grep used to search a pattern from input.

e.g. grep [pattern] [file1] [file2] [file3] ...

case Sensitive
$ grep 'oracle' employee.txt

case in-sensitive
$ grep -i 'ORACLE' employee.txt

exclude the pattern
$ grep -v 'ORACLE' employee.txt
will result into lines which DOES NOT CONTAIN ORACLE word.

$cat eployee.txt|grep ORACLE

Regards,
Gajanan Source: CoolInterview.com

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