removing first 7 characters of directory names

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# 1  
Old 10-17-2009
Data removing first 7 characters of directory names

Hi, I'm relatively new to unix, and would like to change the following files in a particular directory. The files have names like:


I would like to remove the first 7 characters of each file. For instance, in the first one, I would like M10_90_ to be removed, so the file name becomes Phcn402_3F.ab1

I have been playing with:

for x in M1*;do mv $x ${x/nnn/};done

I'm not sure what the correct expression is to remove the first 7 characters (not sure what to put in place of "nnn"). Is there a fast way to do this, or is there a different way to do this, maybe with "rename"?


Last edited by euspilapteryx; 10-17-2009 at 07:31 PM..
# 2  
Old 10-17-2009
for i in M1*
   echo mv "${i}" "${i##???????}"

Once satisfied with the echo-ed results, remove the 'echo'
# 3  
Old 10-17-2009
To remove up to and including the second underscore:
mv "$x" "${x#*_*_}"

# 4  
Old 10-21-2009
Thanks, this is really useful!
# 5  
Old 10-22-2009
How about rename ?

rename 's/(.){7}//' *.ab1

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