Re: How to trap EXIT like in bash

[Thorsten Kampe <thorsten@xxxxxxxxxxxxxxxx>]

* Bart Schaefer (Sat, 4 Apr 2015 11:48:59 -0700)
> 
> On Apr 4,  7:43pm, Thorsten Kampe wrote:
> }
> } elif [[ $shell = zsh ]]
> } then
> }     trap "echo trapped; exit" INT HUP TERM
> } fi
> } 
> } Then Zsh does actually ignore the kill (TERM) signal.
> 
> It doesn't ignore the signal, but it may not run the trap either.  You
> need the trap on EXIT in there:
> 
>     trap "echo trapped; exit" EXIT INT HUP TERM
> 
> That's because it matters whether the shell itself gets the signal, or
> an external job that's been run *by* the shell gets the signal.
> 
> E.g. if I run a script that executes "sleep" and kill the sleep, the
> TERM trap is not run but the EXIT trap will be.  If I kill the shell
> itself, the TERM trap is run but the EXIT trap is not.

It gets even weirder: neither `kill -HUP`, nor `kill -INT` nor `kill 
-TERM` with the PID of the shell have any influence on the script if 
these signals are trapped. What does have an influence is a Ctrl-C 
and `kill -KILL`. 

The kill commands (except `kill -INT`) work immediately with bash 
running the script.

Thorsten