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I have a file abc.txt in my home folder.

~$ cat abc.txt
ls
date

I want want to execute a grep command like
~$ grep 'dat' abc.txt
which gives date in result and date is a shell command. So I want to execute the command which I got in grep result (date) in the same line of grep command.

Is it possible by using | operator like
~$ grep 'dat' abc.txt | [Some command syntax like xargs] which gives the result current time like Fri Nov 4 18:55:06 IST 2016

  • Do you mean cat abc.txt|grep dat? – Katu Nov 4 '16 at 13:52
  • Yes I want the same. I think it gives the same as ~$ grep 'dat' abc.txt – shubham12511 Nov 5 '16 at 8:16
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Is this what you need?
note: this is using the bash shell

# cat abc.txt  
test line 1
date +%F  
test line 3

# $(grep dat abc.txt)  
2016-11-04  

You'll need to be careful on what you filter from the grep command -- all of it will be fired into the shell -- as a single command! So, get a single line match with your filter.

PS: There has to be a better way for this but it escapes me now.
Would help to know what you are really trying to get done here.

  • Yes! Exactly what I needed. Thanx! a lot for helping. – shubham12511 Nov 5 '16 at 8:22
  • Also you can use grep dat abc.txt|bash – makgun Nov 16 '16 at 19:52

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