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Renaming files


Some material is very old and may be incorrect today

© November 2006 Anthony Lawrence

2006/11/21

The email came from a long time customer:

"I modified a script I got off your site and it isn't working right. Here's the the script:


# [A-Z]* matches upper case names
for i in [A-Z]*
do
     j=`echo $i | tr '[A-Z]' '[a-z]'`
      mv $i $j
done

That works fine, but I wanted to do something a little different. So I did this:


# [A-Z]* matches upper case names
for i in [A-Z]*
do
     j=`echo $i | tr '[A-Z]' '[a-z]'`
     cat $i | sed 's/abc/def/' > $j
done

I swear that the files have 'abc' in them, but I always end up with empty files. If I just do "cat A* | sed 's/abc/def/'", the sed works.

So what's wrong with the script?"

My first answer was simply this:

"Nothing wrong with the script. When did you buy a Mac?"

Do you know why I said that?

Answer


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Inexpensive and informative Apple related e-books:

El Capitan: A Take Control Crash Course

Take Control of Apple Mail, Third Edition

Photos for Mac: A Take Control Crash Course

iOS 8: A Take Control Crash Course

iOS 10: A Take Control Crash Course





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