[Swan-dev] understanding output of the tests
paul at nohats.ca
Thu Apr 3 01:58:21 EEST 2014
On Wed, 2 Apr 2014, D. Hugh Redelmeier wrote:
> | Why are the quotes needed when using : ?
> : is really a command that does nothing, rather than a comment.
> So redirection and variable expansion are done on the operands.
> : >file
> would actually create an empty file "file".
> : '>file'
> would act like
> # >file
> (# was introduced with the Bourne Shell. The original UNIX shell
> (before the 7th Edition) didn't have it. ":" served two purposes in
> the old shell: comments and labels (for control flow). The Bourne
> Shell was a great advance in so many ways.)
If that's the only difference, I think we can deal with not using < > | & %
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