echo \ # this is a comment foo
$ sh foo.sh # this is a comment foo.sh: line 2: foo: command not found
After some searching on the web, I found a solution by DigitalRoss on sister site Stack Overflow. So one can do
echo `: this is a comment` \ foo
echo $(: this is a comment) \ foo
However, DigitalRoss didn't explain why these solutions work. I'd appreciate an explanation. He replied with a comment:
There used to be a shell
gotocommand which branched to labels specified like
gotois gone but you can still use the
: whateversyntax ...
:is a sort of parsed comment now.
But I'd like more details and context, including a discussion of portability.
Of course, if anyone has other solutions, that would be good too.
See also the earlier question How to comment multi-line commands in shell scripts?.
Take home message from the discussion below.
`: this is a comment` is just a command substitution.
The output of
: this is a comment is nothing, and that
gets put in the place of
`: this is a comment`.
A better choice is the following:
echo `# this is a comment` \ foo