Bash stack trace and error handling functions

Usually, just copy the err file and source it. Then on any non-zero
return code outside of a conditional, the program will exit and print a
stack trace.

The err file has some functions which you may want to call manually for
different or additional error handling. See the comments at the start of
each one.

For scripts where functions are not used, you can optionally use a more
minimal approach:
set -eE -o pipefail
trap 'echo "$0:$LINENO:error: \"$BASH_COMMAND\" returned $?" >&2' ERR

In the above line, 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>.