CODEWITHSUNDEEP
unixgrepcat
Umesh Patil
Umesh Patil

Reputation: 10685

Unix command to get lines not containing certain text

I have a UNIX log file which contains 1000K lines. Most of the file has lines:

07 Apr 2015 17:54:23.854: Read 0 Messages

I read file using cat filename

I would like to read lines that don't contain a specific text -'Read 0 Messages'

I tried below commands:

cat filename|grep '^{Read 0 Messages}'
cat filename|grep '!{Read 0 Messages}'

Can you advice me correct command?

Upvotes: 7

Views: 24294

Answers (1)

fedorqui
fedorqui

Reputation: 289545

grep can do it:

grep -v "'Read 0 Messages'" file

The -v option is used to indicate what you do not want to be printed.

From man grep:

-v, --invert-match

Invert the sense of matching, to select non-matching lines. (-v is specified by POSIX.)

Also, note there is no need to cat file | grep '...'. You can directly say grep '...' file.

Upvotes: 21

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