Remove file extension using the linux shell script

remove_file_extension.sh

```
#!/bin/sh
for file in `ls *.html`
do
newname=`echo $file|sed 's/\.html$//g'`
mv $file $newname
done
```

nice, but if you extend it a little bit it might be better

!/bin/sh

extension = '.html'
for file in ls *${extension}
do
newname=echo $file|sed 's/\${extension}$//g'
mv $file $newname
done

this should work, not tested.

newname="${file//.html}"

So shorter:

ls *.html | while read file
do
  mv "${file}" "${file//.html}"
done

This is a really good reference to learn more about bash : https://tldp.org/LDP/abs/html/

About string manipulation : https://tldp.org/LDP/abs/html/string-manipulation.html