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From:	"Conway, Timothy" <Timothy DOT Conway AT jbssa DOT com>
To:	"melkor AT orangepalantir DOT org" <melkor AT orangepalantir DOT org>,
	"cygwin AT cygwin DOT com" <cygwin AT cygwin DOT com>
Date:	Fri, 24 Sep 2010 15:21:35 -0600
Subject:	RE: backtics
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This probably isn't a backtic problem, but using backtics causes it.

ls `ls`

results in file not found errors. ie:

bash-3.2$ ls
35ms  40ms  80ms
bash-3.2$ ls `ls`
ls: cannot access 35ms: No such file or directory
ls: cannot access 40ms: No such file or directory
ls: cannot access 80ms: No such file or directory bash-3.2$

++++++++++++++++++++++++++++++++++

Almost certainly we're looking at whitespace characters.  "ls" reads the di=
rectory and displays the names., but command expansion delivers them as a w=
hitespace-delimited array.  Here's the same thing duplicated several ways o=
n AIX.


tconway AT tsmserv
/home/tconway>mkdir whitespace
tconway AT tsmserv
/home/tconway>cd whitespace
tconway AT tsmserv
/home/tconway/whitespace>touch '35ms '  '40ms '  '80ms '
tconway AT tsmserv
/home/tconway/whitespace>ls
35ms   40ms   80ms=20
tconway AT tsmserv
/home/tconway/whitespace>ls `ls`
ls: 0653-341 The file 35ms does not exist.
ls: 0653-341 The file 40ms does not exist.
ls: 0653-341 The file 80ms does not exist.
tconway AT tsmserv
/home/tconway/whitespace>ls |cat -vet
35ms $
40ms $
80ms $
tconway AT tsmserv
/home/tconway/whitespace>cd ..
tconway AT tsmserv
/home/tconway>rm -rf whitespace
tconway AT tsmserv
/home/tconway/whitespace>rm '35ms '  '40ms '  '80ms '
tconway AT tsmserv
/home/tconway/whitespace>touch '
35ms' '40ms=20
> ' ' 80 ms      '
tconway AT tsmserv
/home/tconway/whitespace>ls

35ms   80 ms       40ms

tconway AT tsmserv
/home/tconway/whitespace>ls `ls`
ls: 0653-341 The file 35ms does not exist.
ls: 0653-341 The file 80 does not exist.
ls: 0653-341 The file ms does not exist.
ls: 0653-341 The file 40ms does not exist.
tconway AT tsmserv
/home/tconway/whitespace>ls |cat -vet
$
35ms$
 80 ms^I $
40ms$
$
tconway AT tsmserv
/home/tconway/whitespace>rm *
tconway AT tsmserv
/home/tconway/whitespace>touch '35ms  40ms  80ms'
tconway AT tsmserv
/home/tconway/whitespace>ls
35ms  40ms  80ms
tconway AT tsmserv
/home/tconway/whitespace>ls `ls`
ls: 0653-341 The file 35ms does not exist.
ls: 0653-341 The file 40ms does not exist.
ls: 0653-341 The file 80ms does not exist.
tconway AT tsmserv
/home/tconway/whitespace>ls |cat -vet
35ms  40ms  80ms$
tconway AT tsmserv
/home/tconway/whitespace>rm *
tconway AT tsmserv
/home/tconway/whitespace>touch "`(time sleep 1) 2>&1`"
tconway AT tsmserv
/home/tconway/whitespace>ls

real    0m1.002s
user    0m0.001s
sys     0m0.001s
tconway AT tsmserv
/home/tconway/whitespace>ls -l
total 0
-rw-r--r--    1 tconway  admins            0 Sep 24 15:19=20
real    0m1.002s
user    0m0.001s
sys     0m0.001s
tconway AT tsmserv
/home/tconway/whitespace>rm *
tconway AT tsmserv
/home/tconway/whitespace>touch "Hello.  I am a unix file.
> I'm still just this one single file, but I have many lines
> in my name.  I even have \"all three\" types of \\quotes in my name"
tconway AT tsmserv
/home/tconway/whitespace>ls
Hello.  I am a unix file.
I'm still just this one single file, but I have many lines
in my name.  I even have "all three" types of \quotes in my name
tconway AT tsmserv
/home/tconway/whitespace>ls -l
total 0
-rw-r--r--    1 tconway  admins            0 Sep 24 15:15 Hello.  I am a un=
ix file.
I'm still just this one single file, but I have many lines
in my name.  I even have "all three" types of \quotes in my name
tconway AT tsmserv
/home/tconway/whitespace>cd ..
tconway AT tsmserv
/home/tconway>rm -rf whitespace
tconway AT tsmserv
/home/tconway>

That last one's a funny one to drop on a new unix user.





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