Is it possible to find out in a bash script how it was launched?

Question

linux

For example, through cron or manually from the terminal.

Answer 1

The most reliable way is to set an environment variable in the crontab, and read this environment variable in the script, but you need to change the crontab:

CRON_MODE=1
* * * * * env > ~/env

The env file will include:

SHELL=/usr/bin/sh
USER=rpg
PATH=/usr/bin:/bin
PWD=/home/rpg
SHLVL=1
HOME=/home/rpg
CRON_MODE=1
LOGNAME=rpg
_=/usr/bin/env

www.stackoverflow.com/a/3215128

Answer 2

Has Google gone down?

Answer 3

If only to try to use the $PPID variable.
But it didn't show my crontab. Only sh, as the interpreter that launched the cron.