"Mv" command does not work in loop, but works manually

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# 1  
"Mv" command does not work in loop, but works manually

Hi there, this may be a beginner's error, but I've been unable to find a solution on my own and by googling, and now I am really stuck on it.

I am simply trying to move directories called for example CAT_Run01.ica to a directory with the corresponding number, Run01, in the same directory.

For some reason the loop does not work
		nrun=`ls -d CAT_Run??.ica | wc -l`							
		for run in `seq 1 $nrun`; do
			mv CAT_Run0$run.ica Run0$run

The "mv" command works manually: if I instead of looping type "run=1", then the line "mv CAT_Run0$run.ica Run0$run" will work and move "CAT_Run01.ica/" to "Run01/". The sequence works, it prints out the correct numbers.

But for some reason, when running the loop, I get the error:
"-bash: 0.ica: command not found"

Psychology student just trying to work with some data

Last edited by vbe; 11-05-2019 at 04:18 PM..
# 2  
The file names and the sequence number are not necessarily synchronised; e.g. a single file CAT_Run02 will yield an nrun value of 1 and so the seq will never produce a match. A different approach should be chosen.

Howsoever, this would not explain the error message you saw. Nor can I. Pls run the script again with the -x (xtrace) option set, and post the result.
# 3  
Perhaps you want
for f in CAT_Run??.ica; do
  test -f "$f" &&
  echo mv "$f" "${f#CAT_}"

Important: the arguments to mv (and test) must be in "quotes".

Last edited by MadeInGermany; 11-05-2019 at 07:03 PM.. Reason: Added a test -f
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