shell script to change the extension of a file

Shell Programming and Scripting
1

I have a directory that contains several files, out of which some files are have an extra extension for example

file1.new.new.new
file2.new.new.new
file3.new.new.new
file4.new.new.new

i want to write a shell script that rename all such file with only single extension like

file1.new
file2.new
...

need help on this

2

Please refer to :-

3

Hi
it isn't working for me, below is one of the sample file i have

example.new.new.new.new.new

Expected output

example.new

I have tried using below script

IFS="."
for i in *.new*
do
     set -- "$i"
     mv "$i" "$1.$2"
done

Have also tried below

#!/bin/bash
for i in *.new*
do
     mv "$i" "$(basename "$i".new)"
done
4 
 
for i in *.new*
do
filename=$(echo "${i}" | cut -d. -f1)
ext=$(echo "${i}" | cut -d. -f2)
mv "$i" "${filename}.${ext}"
done
1 Like
5

Another option:

for f in *.new
do
  mv "$f" "${f%%.new.*}.new"
done

or try the general case and pick the leftmost extension of files that have two or more extensions:

for f in *.*.*
do
  mv "$f" "${f%.${f#*.*.}}"
done
1 Like
6

Hi,

just tried this

[root@centos5 test]# ls -1 | awk  -F"." '{ print $0,$1".new" }' | xargs -n2 echo  mv
mv file10.new.new.new file10.new
mv file1.new.new.new file1.new
mv file2.new.new.new file2.new
mv file3.new.new.new file3.new
mv file4.new.new.new file4.new
mv file5.new.new.new file5.new
mv file6.new.new.new file6.new
mv file7.new.new.new file7.new
mv file8.new.new.new file8.new
mv file9.new.new.new file9.new

Note:- remove echo after checking..&& run above code in that directory where file exists

7

hi scrutinizer,
thanks for your post, could you please explain me the meaning of this line :

mv "$f" "${f%%.new.*}.new"
8

Hi, this is called parameter expansion. It cuts off the the first ".new" and everything after that... and then appends ".new"