Junio C Hamano <gits...@pobox.com> writes:
> Tom Russello <tom.russe...@grenoble-inp.org> writes:
>
>> +# Check if two files have the same content, non-order sensitive
>> +test_cmp_noorder () {
>> + sort $1 >$1;
>
> Here is what I think happens:
>
> 0) the shell parses this command line;
> 1) the shell notices that the output has to go to $1;
> 2) the shell does open(2) of $1,
> 3) the shell spawns "sort" with a single argument, with its
> output connected to the file descriptor obtained in 2).
>
> Because "$1" becomes an empty file at 2), "sort" reads nothing and
> writes nothing.
Tom: in case you're not convinced, try this:
$ (echo b; echo a) >f
$ sort f
a
b
$ sort f >f
$ cat f
$
Also, useless ';' and missing double-quotes around "$1" to avoid bad
surprises ifever test_cmp_noorder is called on file names with special
characters.
--
Matthieu Moy
http://www-verimag.imag.fr/~moy/
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