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> Moving Groups Of Files From Upper To Low
post Jul 15 2003, 09:01 AM
Post #1

Its GNU/

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Often times when you transfer files from Windows to Linux, they end up with all Capital letters. While generally, this isn't much of a problem, sometimes this includes large directories and Linux will not see "FILENAME.EXE" the same as "filename.exe". The solution is to issue the following perl command to rename everything in a directory from upper to lower case:

perl -le 'rename $_, lc( $_ ) foreach <*>'

This "tip" is available through the random tip son the frontpage.

Corey Quilliam
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post Dec 10 2003, 06:41 AM
Post #2

Its GNU/

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Ok ... here is the explaination:

PERL is magic laugh.gif
Actually, the perl -l is to run perl, -e switch allows you to execute the information inside the quotes with the perl interpretor ... it's like running a perl script that contains the information inside the quotes ... in this case the perl command that is executed is: rename $_, lc( $_ ) foreach <*>

$_ (in perl) is the topic ... which in generic terms means the currently selected item...if you want a more detailed explaination of topic, see this. In this code, the topic is going to be a filename.

lc() is a function in perl to convert text to lowercase ... in this example, it converts $_ (the filename) to lowercase.

rename x,y in perl will rename file x to the name y ... it is very similar to the command mv in bash (except there is a comma between filenames). In this case $_ (the original filename) is renamed to lc($_) the lowercase filename.

foreach defines a list of items to do sometime on ... in this case <*> will generate a list including all files in a directory...try this command to see a list of all the files in a directory: perl -le 'print $_ foreach <*>'

So, put it all together and perl -le 'rename $_, lc( $_ ) foreach <*>' will convert all filenames in a directory to thier lowercase equivalant.

I actually know a little bit about perl ... see my old website ... which I haven't updated since 1999 (i think) ... I don't even know the passwords to make changes to the site anymore....(WOW what a flashback!)

Johnny Hughes
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