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My team share a shell script, I want to make it Cygwin-compatible because only me is on Windows. Now the problem comes from source. My shell only accepts format like:

source ./<file name>

instead of

source <file name>

which is already in the script. So I want to override source like:

source(){ . ./$@; }

But now my shell complains that:

`source': is a special builtin

What should I do for now?

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    Are you sure it's not just because of a mismatch in the $PATH? source uses the $PATH if the filename isn't explicit. Does your $PATH include .? Non-explicit paths are dangerous anyway, so I would tell your developers to fix the scripts. Apr 6 '17 at 13:58
  • @EightBitTony at least with Bash on Linux, it tries $PWD after $PATH, even though there is no . in my $PATH.
    – derobert
    Apr 6 '17 at 14:40
  • Uh, no. $PWD is in fact not automagically fake-added to $PATH by default. Why would you presume this to be so?
    – DopeGhoti
    Apr 6 '17 at 15:15
  • @DopeGhoti was that directed at me? If so, I'd presume it be so because I tested it, and the bash manpage documents the behavior as well. In fact, I just tested it on a fresh Cygwin install, where it is too.
    – derobert
    Apr 6 '17 at 15:29
  • @Elderry I tried on a fresh Cygwin install, and it works for me. Is your Cygwin using a non-bash shell, or maybe your bash is set to run in POSIX mode?
    – derobert
    Apr 6 '17 at 15:30
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From that error message about a special builtin (see http://sources.debian.net/src/bash/4.4-4/execute_cmd.c/?hl=5623#L5623), it appears you're running bash in POSIX mode. This might be because you have $POSIXLY_CORRECT set, ran the shell with --posix, used set -o posix, etc.

One of the many things POSIX mode does (in addition to not let you override source) is make source (and .) not search the current working directory if $PATH-lookup fails.

This has nothing to do with running on Cygwin.

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