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Let say in a text file if I do

grep FINAL *.msg

it returns 

FINAL   COMPUTATIONS:  Elapsed Time: 000:30:55.65; CPU Time: 000:30:26.53  
FINAL   COMPUTATIONS:  Elapsed Time: 000:28:11.77; CPU Time: 000:27:41.36

Now if I do for loop as 

for line in `grep FINAL *.msg`

the "$line" does not consider "FINAL COMPUTATIONS: Elapsed Time: 000:30:55.65; CPU Time: 000:30:26.53" as a single line.

How I can solve this?

steeldriver
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Akand
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    Related, I think: [Reading lines from a file with bash: for vs. while](https://unix.stackexchange.com/questions/24260/reading-lines-from-a-file-with-bash-for-vs-while) – steeldriver Jan 14 '19 at 20:27
  • Your question reads to me like this could very well be a form of "XY Problem" (see: https://en.wikipedia.org/wiki/XY_problem). Please edit your question to show exactly what it is you are trying to _accomplish_ with your input data. – DopeGhoti Jan 14 '19 at 21:12

2 Answers2

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It has to do with the way the shell is splitting your input. Keep in mind that, unless told otherwise, any whitespace will generally split inputs:

$ echo "Foo bar baz"
Foo bar baz
$ for word in $(echo "Foo bar baz"); do echo $word; done
Foo
bar
baz
DopeGhoti
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  • Thanks for your reply. My question, whatever is `grep` with FINAL (e.g. "FINAL COMPUTATIONS: Elapsed Time: 000:30:55.65; CPU Time: 000:30:26.53"), how I can loop so that `$line` returns complete line (not FINAL, COMPUTATIONS:, Elapsed, Time, etc. as separate lines)? – Akand Jan 14 '19 at 20:50
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DopeGhoti is absolutly right, here's something which fits probably a bit more. Read linewise from grep output (pattern applied to all *.msg files in current directory) with help of process subtitution:

i=0; 
while read -r line; do 
    echo $((i++)) "$line"; 
done < <(grep "FINAL" ./*.msg)

snippet is free of shellcheck warnings :)

Christian Stenzel
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