On Sat, Jan 04, 2003 at 09:51:21PM -0500, Fraser Campbell wrote:
> On January 4, 2003 09:20 pm, the fabulous Gerald V. Livingston II wrote:
>
> > Thank you. Took a couple of tries to get the syntax correct but I
> > ended up with this:
> >
> > if [ `ls *.jpg 2>/dev/null|wc -l` -gt 0 ]
> >
> > then for i in *.jpg; do mmv "$i" `date +%s`-$a.jpg; a=a+1; done
> >
> > fi
>
> If there were thousands of jpgs you'll probably still get a "too many
> arguments" error with that for loop. I usually do something like this:
Nope, The for is "internal" to the shell. It will not suffer from the
"too many arguments" problem. Whereas, the "ls" you suggest is external
and WILL have that problem!
>
> ls *.jpg | while read i; do
> mv "$i" `date +%s`-$a.jpg; a=a+1
> done
[ I created a directory whith too many files and then: ]
sh-2.05$ ls * | while read i ; do
> echo $i
> done
sh: /bin/ls: Argument list too long
sh-2.05$
[ whereas: ]
sh-2.05$ for i in * ; do echo $i; done
....
alksdjfklasjljkdasjkladsjklasdjlkasjkldfljksljkjklassdkljfljkdsfjlsalkfj999
h-2.05$
("ls" IS internal on some shells, but apparently not in mine, or maybe
not when running non-interactively, but then again, I DID do this
interactively... )
Roger.
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