removing files with certain number in the first row

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# 8  
Old 10-05-2009
What shell are you using? I don't get these errors (with ksh/bash).

bash code:
  1. ls | while read file
  2. do
  3.   [ "$(sed -n "/^0.00/p;q" $file 2>/dev/null)" ] && echo rm -f $file
  4. done
(remove the echo after testing)

Anything which expands the file list as arguments to the program (like grep ... *; rm $(...) is potentially problematic if there are too many files. The -i option of xargs is not POSIX standard.

Last edited by Scott; 10-05-2009 at 06:16 PM..
# 9  
Old 10-05-2009
I tried

set A = (ls | xargs -i grep -l ^0.00 {})
rm -f $A

but it didn't workSmilie

---------- Post updated at 04:27 PM ---------- Previous update was at 04:24 PM ----------

I am using C shell!
# 10  
Old 10-05-2009
Why are you using C Shell?

99.9% of the answers you get here will be bash or ksh based.

Can't you just add




to the first line of your script?!

Would make life simpler for everyone!
# 11  
Old 10-05-2009
It helps if you scrape the screen output so I can see the actual error message.

Keep in mind this was written in the korn shell, if you use a different shell you may want to break it down and check the syntax.

I should mention somewhat belatedly that this will delete all files containing any line beginning with 0.00, not just the first. So you will need to modify it if you want to narrow the scope of the files deleted.

With regard to breaking down the code: -

rm -f $(ls | xargs -i grep -l ^0.00 {})

rm -f expects a filename as an argument so we generate the list of file names in the sub shell: -

ls | xargs -i grep -l ^0.00 {}

The ls command is piped into xargs which feeds the file names into grep one at a time in the position marked by {}. The -l option for grep tells it to just output file names; as this is all done in the subshell the names of the files containing the pattern are fed back to the rm statement.

Experiment and try it a chunk at a time till you get it working, then modify it to head each file instead.

Good luck
# 12  
Old 10-05-2009
Scottn, your code perfectly finds the file but doesn't remove it

Thanks steady for your comments
# 13  
Old 10-05-2009
Did you remove the echo? It will echo the rm command only. If you're happy with the result, remove the echo.
# 14  
Old 10-05-2009
This will go through the list of files and delete the appropriate ones..

ls | awk '{getline line < $0; close($0); if(line ~ /^0\.00/){ print "removing " $0;system("rm " $0)} }'

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