Execute logic before each command line .bashrc

Question

I would like to add some logic to be executed each time I just press enter in the unix terminal, eg print hello:

sergei_rudenkov@ws18851:~$ 
Hello
sergei_rudenkov@ws18851:~$

I use ubuntu 14.04 and I found the way to print sting each time I launch new terminal, but I didn't find place to execute some logic each time the new command line appears.

Could you help me and is it possible at all?

Do you want to execute the code "each time you press enter" (eg, before running a command) or "each time the new [prompt] appears" (eg, after running a command)? — William Pursell, Jan 21 '16 at 13:32

score 4 · Accepted Answer · answered Jan 21 '16 at 13:28

4

The contents of PROMPT_COMMAND are executed just before each prompt is displayed.

$ PROMPT_COMMAND='echo hello'
hello
$
hello
$ echo foo
foo
hello
$

answered Jan 21 '16 at 13:28

chepner

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Execute logic before each command line .bashrc

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