Looking for command to remove special character using VI edit in Unix operating system?

Special character like ^M in your shell script file will eventually caused problem as you run the script.

Interpreter “/usr/bin/ksh” not found is one of the example error you will got if there’s special character ^M in your scripting file.

Remove Unix Special Character Command

$ ./script.sh 
interpreter "/usr/bin/ksh" not found
ksh: ./script.sh:  not found

Open your file in VI editor and type :%s/(CTRL-V)(CTRL-M)//g to fix this.

The ^M will be removed once you hit the Enter button.

$ vi script.sh
:%s/(CTRL-V)(CTRL-M)//g

^v is a CONTROL-V character and ^m is a CONTROL-M character and :%s is a basic search and replace command in vi with g at the end will replace all matching globally.