Functions to deal with errors in bash

errcatch: set a trap on error to do bash-trace and exit
errallow: undo errcatch
errexit: exit and print stack trace
bash-trace: print stack trace (best bash stack trace ever)

the err* functions depend on bash-trace.

For scripts without any nested function calls, this is usually sufficient:
set -eE -o pipefail
trap 'echo "$0:$LINENO:error: \"$BASH_COMMAND\" returned $?" >&2' ERR

Cleanup commands or functions can be appended to the ERR trap after a
semicolon within the single quotes.

Related: see my bash script template repo, at https://iankelling.org/git.

Please email me if you have a patches, bugs, feedback, or republish this
somewhere else: Ian Kelling <ian@iankelling.org>.