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On Saturday 31 December 2005 20:38, Matthias Bethke wrote: |
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> Hi David, |
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> |
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> on Thursday, 2005-12-29 at 13:53:17, you wrote: |
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> > > $(ls *.jpg) |
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> > |
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> > ick! |
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> > |
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> > (incidentally, http://www.ruhr.de/home/smallo/award.html#ls) |
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> |
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> Well, it's bad in two ways, and even the example on the above webpage |
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> is wrong. For one thing, "ls" is useless here. For another, it will |
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> break |
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> |
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> on spaces in filenames, unlike shell globbing: |
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> | $ touch "foo bar.jpg" |
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> | $ for f in *.jpg; do echo $f; done |
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> | foo bar.jpg |
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> | $ for f in `ls *.jpg`; do echo $f; done |
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> | foo |
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> | bar.jpg |
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> | $ for f in `ls *.jpg`; do echo "$f"; done |
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> | foo |
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> | bar.jpg |
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> |
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> The bottommost try shows that the comment "newbies will often forget |
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> the quotes, too" is wrong -- it won't work either way. If you have to |
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> use |
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> |
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> a program that outputs a filename per line like ls, use a read loop: |
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> | $ ls *.jpg | while read f; do echo "$f"; done |
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> | foo bar.jpg |
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> |
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> The quotes are useless for "echo" here, but for other commands you'll |
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> usually need them to keep the command form taking filenames with |
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> sapaces as separate arguments. |
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> |
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> cheers! |
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> Matthias |
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|
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It is the first part of the command, the one expanding ls output that |
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needs quotes... |
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|
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$ for f in $"`ls *.jpg`"; do echo $f; done |
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foo bar.jpg |
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|
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Ciao |
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Francesco |
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-- |
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Linux Version 2.6.14-gentoo-r6, Compiled #0 PREEMPT Sat Dec 31 01:17:32 |
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CET 2005 |
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One 1GHz AMD Athlon 64 Processor, 2GB RAM, 2007.23 Bogomips Total |
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aemaeth |
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-- |
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