Argument list too long w/ sed

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# 1  
Old 09-05-2013
Apple Argument list too long w/ sed

Hi all,

I am using GNU sed (named gsed under macports) in OSX. I have a directory with a series of files named pool_01.jpg through pool_78802.jpg. I am trying to use this command to rename the files to their checksum + extension.
md5sum * | gsed -e 's/\([^ ]*\) \(.*\(\..*\)\)$/mv -v \2 \1\3/e'

That's GNU md5sum through macports.

However I get
-bash: /opt/local/bin/md5sum: Argument list too long


How best to get around this ?

Last edited by Franklin52; 09-05-2013 at 04:37 AM.. Reason: Please use code tags
# 2  
Old 09-05-2013
78000 file names is a lot of text when taken together. ARG_MAX is the limit to the total size of the arguments in bytes given to a command, including all env variables (like PATH, etc.)

one way around the problem, if I get what you are doing with sed:
ls | while read fname 
 md5sum $fname | gsed -e s/\([^ ]*\) \(.*\(\..*\)\)$/mv -v \2 \1\3/e'
done [... more code]

# 3  
Old 09-05-2013
That worked except you missed a comma. Thanks !

Finished script


ls | while read fname 
 md5sum $fname | gsed -e 's/\([^ ]*\) \(.*\(\..*\)\)$/mv -v \2 \1\3/e'

# 4  
Old 09-05-2013
Shorter and faster:
ls | xargs md5sum | ...

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