Hi! I have a problem with my shell script. I need a script that rename files like: File.001.txt File.002.txt File.003.txt to File.51.txt File.52.txt File.53.txt etc.. Or File.0016.txt File.0017.txt File.0018.txt to File.0131.txt File.0132.txt File.0133.txt etc.. The maximum of numbers that can contain each file is 4 (File.####.txt). How can I do that? My biggest problem is in how i put the exact number of 0's before the renamed files. The call must be this way: ./rename.sh $1 $2 $3 $File.####.txt $File.##.txt where $1 is the number it starts the first file. $2 the number it finish. $3 the number it begins the renamed file. p.e.) ./rename.sh 1 15 71 File.###.txt File.##.txt File.001.txt -> File.71.txt File.002.txt -> File.72.txt File.003.txt -> File.73.txt File.004.txt -> File.74.txt File.005.txt -> File.75.txt File.006.txt -> File.76.txt File.007.txt -> File.77.txt File.008.txt -> File.78.txt File.009.txt -> File.79.txt File.010.txt -> File.80.txt File.011.txt -> File.81.txt File.012.txt -> File.82.txt File.013.txt -> File.83.txt File.014.txt -> File.84.txt File.015.txt -> File.85.txt Thx a lot!!