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In Linux, would it be possible to create a multi-pipe command, serving the same type of command ie: grep however different output alteration done to it?

Strict example:

grep 10-Feb file.txt | awk '{print $2}' | cut -d . -f 1,2 | sort | uniq -c | sort -rn | head -20 ; 
grep 10-Feb file.txt | awk '{print $2}' | sort | uniq -c | sort -rn | head ; 
grep 10-Feb file-txt [..]

Would it be possible to make the first grep and path an argument, and make it automatically apply to the following commands? 

$=[grep 10-Feb file.txt] | awk '{print $2}' | cut -d . -f 1,2 | sort | uniq -c | sort -rn | head -20 ; 
$ | awk '{print $2}' | sort | uniq -c | sort -rn | head ; 
$ [..]

As an edit:

I cannot set-up the above command in a bash script since I have limited access to root from which I can call the scripts from.

I am interested in assigning a command as a variable from the command line solely.

Gilles 'SO- stop being evil'
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George
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1 Answers1

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By "in Linux" you probably mean "in Bash".

And the answer is yes, they are called functions:

http://tldp.org/HOWTO/Bash-Prog-Intro-HOWTO-8.html

In ruby (which runs in linux) you can load your code blocks in lambdas (which are unnamed functions)

Bruno9779
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  • Hey Bruno! I am actually interested in doing in non-bash situations. Essentially interested in running a single command using variables. In the current case, due to limitations, I cannot use a bash script, solely the commands. – George Mar 30 '17 at 13:57
  • You know, this answer be a lot more useful [if it didn't rely on only the link](https://meta.stackexchange.com/questions/8231/are-answers-that-just-contain-links-elsewhere-really-good-answers) but e.g. gave an example relevant to this situation. Answers with only links also have the risk that the link will rot, making the answer pretty much useless. – ilkkachu Mar 30 '17 at 14:12
  • @ilkkachu You are generally right, but I suspect that tldp.org will outlive the SO stack (it is official documentation, not some blog). I also think that OP need to be pointed to some quality bash documentation. – Bruno9779 Mar 30 '17 at 14:22
  • @Bruno9779, I was under the impression that as a GNU program, Bash's [official documentation](https://www.gnu.org/software/bash/manual/) would be maintained by the GNU project. In any case, a document from 2000 might not be the best reference, and this answer does not contain the actual answer, just a pointer. – ilkkachu Mar 30 '17 at 14:31