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In POSIX sh, source in place of . is undefined

Problematic code:

#!/bin/sh
source /usr/lib/myfile.sh

Correct code:

#!/bin/sh
. /usr/lib/myfile.sh

Rationale:

Your script uses a shell feature not supported by the shebang. Either rewrite the script to be portable, or change the shebang to explicitly require a shell like Bash.

source is a Bash/Ksh specific, readable synonym for .. In this case, you can for the most part easily replace source with .

Do note that source myfile in POSIX sh only searches $PATH, while Bash/Ksh will additionally search the current directory.

Exceptions:

None

Related resources:

• Help by adding links to BashFAQ, StackOverflow, man pages, POSIX, etc!

ShellCheck is a static analysis tool for shell scripts. This page is part of its documentation.