CODEWITHSUNDEEP
unixgrep
aruighrha
aruighrha

Reputation: 69

grep a byte-point without macth-output

I'm using a grep

I want to output only offset-point.

But now my commands are being printed out to offsets and macthing-keywords.

My command is

grep -Pbzo 'macthing-keywords' test.txt

output is..

15 : macthing-keywords

I want '15' to be printed out, representing offset (not macthing-keywords is printed)

Can you tell me how?

Upvotes: 1

Views: 24

Answers (1)

Wiktor Stribiżew
Wiktor Stribiżew

Reputation: 626747

You may simply remove any <space>:<space><anything that remains here> with a sed command like sed 's/ : .*//' or you may delete all after first : with cut -d: -f1 (as suggested by @bigdataolddriver):

grep -Pbzo 'macthing-keywords' test.txt | sed 's/ : .*//'

Or

grep -Pbzo 'macthing-keywords' test.txt | cut -d: -f1

To output to a file:

grep -Pbzo 'macthing-keywords' test.txt | sed 's/ : .*//' > outputfile.txt

If you have multiple matches per line, you may need to separate them before running sed or cut:

xargs -0 | grep -Pbzo 'macthing-keywords' test.txt | \
  xargs -0 -n1 | cut -d: -f1 > outputfile.txt

Or, which seems safer as it will remove :... even if the matches contain linebreaks and those match continuations might also have : in them (but this solution requires sed that supports \xXX notation):

xargs -0 | grep -Pbzo 'macthing-keywords' test.txt  | \
   sed 's/ *:[^\x00]*//g' | xargs -0 -n1 > outputfile.txt

The xargs -0 / xargs -0 -n1 pair will handle the match breaks turning NULs to newlines.

Upvotes: 1

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