(or "In dash, ... is not supported." when using
dash
)
Also applies to RETURN and DEBUG.
#!/bin/sh
trap 'Command failed with $?' ERR
Switch to a shell like ksh
or bash
that
does support the kind of trap you want:
#!/bin/bash
trap 'Command failed with $?' ERR
Otherwise, rewrite the script to not rely on the trap.
You are trying to install a trap that is not supported by your
current shell (dash
or POSIX sh
). There is no
simple replacement. The script should be rewritten to avoid depending on
the trap, or simply be run with a shell that supports it.
If you only intend to target shells that supports this feature, you can change the shebang to a shell that guarantees support, or ignore this warning.
You can use # shellcheck disable=SC3000-SC4000
to ignore
all such compatibility warnings.
ShellCheck is a static analysis tool for shell scripts. This page is part of its documentation.