# Paging unix nerds, need help with mass file extension change
**URL:** https://forums.speedlife.net/t/paging-unix-nerds-need-help-with-mass-file-extension-change/162001
**Category:** NYSpeed Off Topic
**Created:** [October 27, 2010, 8:05am UTC](https://forums.speedlife.net/t/paging-unix-nerds-need-help-with-mass-file-extension-change/162001 "2010-10-27T08:05:29Z")
**Posts on this page:** 5
**Page:** 1
### Author:  [@neonglh](https://forums.speedlife.net/u/neonglh)
#### Post date: [October 27, 2010, 8:05am UTC](https://forums.speedlife.net/t/paging-unix-nerds-need-help-with-mass-file-extension-change/162001/1 "2010-10-27T08:05:29Z")
I have about 400 .htm files that I need to change to .html. There is absolutely no way that I am going to do this by hand. Does anyone know of any unix commands that would allow me to do this. I assume it’s in the realm of regular expressions.
I tried my luck and went with:
mv \*.htm \*.html
That did not work!
Let me know what would be my best bet. Thanks!
–mark
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### Author:  [@boardjnky4](https://forums.speedlife.net/u/boardjnky4)
#### Post date: [October 27, 2010, 8:07am UTC](https://forums.speedlife.net/t/paging-unix-nerds-need-help-with-mass-file-extension-change/162001/2 "2010-10-27T08:07:14Z")
ugh, I know there is a way but I’m not remembering it, hold on
edit:
after a quick google search and a quick test
ls -d _.htm | sed 's/(._).htm$/mv “&” “\1.html”/’ | sh
simpler option:
for i in \* ; do mv “$i” `basename "$i" .htm`.html ; done
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### Author:  [@itsJim](https://forums.speedlife.net/u/itsJim)
#### Post date: [October 27, 2010, 8:10am UTC](https://forums.speedlife.net/t/paging-unix-nerds-need-help-with-mass-file-extension-change/162001/3 "2010-10-27T08:10:45Z")
for i in \*.htm;
do mv $i ${i%%.htm}.html;
done
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### Author:  [@neonglh](https://forums.speedlife.net/u/neonglh)
#### Post date: [October 27, 2010, 8:11am UTC](https://forums.speedlife.net/t/paging-unix-nerds-need-help-with-mass-file-extension-change/162001/4 "2010-10-27T08:11:34Z")
You sir, are the man!
Thank you much!
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### Author:  [@ProgRocker](https://forums.speedlife.net/u/ProgRocker)
#### Post date: [October 27, 2010, 8:14am UTC](https://forums.speedlife.net/t/paging-unix-nerds-need-help-with-mass-file-extension-change/162001/5 "2010-10-27T08:14:01Z")
\ Problem solved I guess