CODEWITHSUNDEEP
grep
vmicrobio
vmicrobio

Reputation: 331

get specific lines with grep

I would like to parse a text like that:

# cmd: Text_finder --outdir 1
# No Text found
# cmd: Text_finder --outdir 2
ID_Text ID element  pos_beg pos_end model   type    default distance
Text_01 tt  001 38  108 1   6.3e-05     No
Text_01 tt  002 454 517 1   1.9e-05     No
Text_01 tt_c7   003 1276    1362    1   2.2e-08     No
# cmd: Text_finder --outdir 3
# No Text found
# cmd: Text_finder --outdir 4
# No Text found
# cmd: Text_finder --outdir 5
ID_Text ID element  pos_beg pos_end model   type    default distance
Text_01 tt  001 38  108 1   6.3e-05     No

in order to retrieve lines starting with "Text_01" (results), "ID_Text" (headline) but also line before "ID_Text" (starting with "# cmd:" but also common to the line with no result I want to get ride off).

I have tried to combine and execute these lines:

#get lines with "ID_text" and "text_01"
grep -P "ID_text|text_01" result.txt > positive-results.txt;

#get line before line with "ID_text" 
grep -B1 "ID_text" result.txt > positive-results.txt;

but I cannot get a file like that:

# cmd: Text_finder --outdir 2
ID_Text ID element  pos_beg pos_end model   type    default distance
Text_01 tt  001 38  108 1   6.3e-05     No
Text_01 tt  002 454 517 1   1.9e-05     No
Text_01 tt_c7   003 1276    1362    1   2.2e-08     No
# cmd: Text_finder --outdir 5
ID_Text ID element  pos_beg pos_end model   type    default distance
Text_01 tt  001 38  108 1   6.3e-05     No

Do you have a smart way to do that?

Thanks a lot

Upvotes: 0

Views: 84

Answers (1)

James Brown
James Brown

Reputation: 37464

$ grep --no-group-separator -B 1 "^\(Text_01\|ID_Text\)" file

Output:

# cmd: Text_finder --outdir 2
ID_Text ID element  pos_beg pos_end model   type    default distance
Text_01 tt  001 38  108 1   6.3e-05     No
Text_01 tt  002 454 517 1   1.9e-05     No
Text_01 tt_c7   003 1276    1362    1   2.2e-08     No
# cmd: Text_finder --outdir 5
ID_Text ID element  pos_beg pos_end model   type    default distance
Text_01 tt  001 38  108 1   6.3e-05     No

man grep:

-B NUM, --before-context=NUM
          Print NUM  lines  of  leading  context  before  matching  lines.
          Places   a  line  containing  a  group  separator  (--)  between
          contiguous groups of matches.

Interestingly my man page has no explanation for --no-group-separator but try above once without it and you'll see.

Upvotes: 2

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