Comments on: Google SRE Question on Mass Changing File Extensions

By: Sven

Sven — Fri, 21 Nov 2008 16:10:28 +0000

If you have a bash it’s really easy (html->htm):

for i in *.html ; do mv $i ${i%.html}.htm ; done

By: Duncan Anderson

Duncan Anderson — Wed, 30 Jul 2008 08:27:29 +0000

Jeff,

That is brilliant. You have persuaded me to haul out “The AWK book” again. “sub” hmmm…

cheers
Duncan

By: Jeff Schroeder

Jeff Schroeder — Thu, 03 Jul 2008 12:54:27 +0000

With a bit of awk, you can beat everyone:

jeff@jschroeder2:/tmp/foo$ ls
file1.html file2.html file3.html file4.html
jeff@jschroeder2:/tmp/foo$ ls | awk ‘{printf(”%s %s “, “mv”, $1); sub(/\.html$/, “.htm”); print $1}’ | sh
jeff@jschroeder2:/tmp/foo$ ls
file1.htm file2.htm file3.htm file4.htm
jeff@jschroeder2:/tmp/foo$ ls | awk ‘{printf(”%s %s “, “mv”, $1); sub(/\.htm$/, “.html”); print $1}’ | sh
jeff@jschroeder2:/tmp/foo$ ls
file1.html file2.html file3.html file4.html

http://www.digitalprognosis.com

By: Duncan Anderson

Duncan Anderson — Tue, 27 May 2008 10:21:54 +0000

Oops. The usage is: changesuffix suffix1 suffix2
The posting mechanism devoured two pairs of lessthan and greaterthan signs which surrounded the strings “suffix1″ and “suffix2″, as well as the strings themselves.

By: Duncan Anderson

Duncan Anderson — Tue, 27 May 2008 10:05:09 +0000

When I posted the script “changesuffix”, the process of posting it removed all of the indentation as well as the second half of the “Usage” line. What the hell is going on? That doesn’t look anything like the script I wrote!

By: Duncan Anderson

Duncan Anderson — Tue, 27 May 2008 10:01:35 +0000

Here is a script which does not require anything other than a standard Bourne shell and awk. (This means it will work across many platforms.)I included some error trapping. This will work for any pair of suffixes.

if [ $# -ne 2 ]
then
echo “Usage: changesuffix ”
exit 1
else
SUFFIX1=$1
SUFFIX2=$2
if [ "$SUFFIX1" = "$SUFFIX2" ]
then
echo “The suffixes must differ.”
exit 1
fi
fi

if ls *.$SUFFIX1 > /dev/null 2> /dev/null
then
:
else
echo “There are no filenames with the suffix .”$SUFFIX1
exit 1
fi

for FILE in *.”$SUFFIX1″
do
mv $FILE “`echo $FILE | awk -F.$SUFFIX1 ‘{print $1}’`.$SUFFIX2″
done

By: Carlos

Carlos — Fri, 23 May 2008 00:58:17 +0000

Oh, forgot to close the quote in the htm used by basename.

By: Carlos

Carlos — Fri, 23 May 2008 00:57:27 +0000

Why does this looks so difficult? Try this: for i in *htm; do mv “$i” $(basename “$i” “.htm).html; done

Hope this helps.

By: PL

PL — Tue, 20 May 2008 00:25:53 +0000

And what about this:

#v+
for x in `ls *.htm`; do mv $x ${x}l; done
#v-

By: Cristian Gutierrez

Cristian Gutierrez — Sat, 03 May 2008 07:40:07 +0000

Here you go. If you get hired, you owe me a referral.

$ ls
a.html b.html c.htm d.htm e.html
$ perl -e ‘for(@ARGV){/(.*htm)(l?)/;rename$_,$1.($2^”l”)}’ *
$ ls
a.htm b.htm c.html d.html e.htm

By: Anonymous

Anonymous — Fri, 07 Mar 2008 07:10:34 +0000

Jarvis Talley’s solution is totally wrong.

By: Kevin Glavin

Kevin Glavin — Fri, 29 Feb 2008 01:18:16 +0000

Here it is in bash and this recurses down through the hierarchy, I cannot remember
if the “for” loop has a max number of elements so an xargs version might be more bulletproof,

Kevin

cd target_dir
for a in `find . -type f -name “*.html”`; do mv $a ${a/html/htm}; done