Instead of just giving you information like some man page, I hope to illustrate each command in real-life scenarios. share|improve this answer edited Oct 11 '16 at 1:43 answered Oct 10 '16 at 2:57 joeytwiddle 9,76734349 2 Is this related to the question in any way? exit $?#!/bin/bash COMMAND1 . . . Exit Bash Shell The diff command gives 0 if files compared are identical, 1 if they differ, and 2 if binaries are different. 2 also means failure.
On Linux: $ find /usr -name sysexits.h /usr/include/sysexits.h $ cat /usr/include/sysexits.h /* * Copyright (c) 1987, 1993 * The Regents of the University of California. exitThe equivalent of a bare exit is exit $? or even just omitting the exit.#!/bin/bash COMMAND_1 . . . how to stop muting nearby strings or will my fingers reshape after some practice? http://thedroidblog.com/exit-code/ssis-the-process-exit-code-was-1073741819.html special variable in bash.
So, unfortunately, the unix powers that be don't seem to enforce any logical set of rules, even on very commonly used executables. A list of signals can be found in the signal man page (run "man signal"). Electrical Propulsion Thrust Should we kill the features that users are not using frequently, to improve performance? Electrical Propulsion Thrust Difference between if else and && || Why do the physical properties of an egg shell change when the egg shell is exposed to vinegar for a week?
It doesn't actually send any signal, only checks that the process is alive, using a shell built-in instead of external processes. fi } 3< <(foo > logfile 2>&1; echo "$?") share|improve this answer edited Sep 28 '15 at 20:11 answered Feb 20 '14 at 14:07 Stéphane Chazelas 190k32316551 add a comment| up There is a more unixesh solution, catching the SIGCHLD signal. done ....
After wait returns, the exit code of the process is returned in the variable $? 2, 3: ps or ps | grep " $! " can tell you whether the process Useful info and explained well!
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