Why is my shell script not executing?

Question

I executed it in terminal using:

sh script.sh

And I get this error:

sh: 0 can't open script.sh 

Solution

The error has nothing to do with gedit and/or nano. Your script call is a bit wrong. This error occurs, if you start sh with an non-existing file in the current folder. Therefore start your script with a full path:

sh /path/to/your/script.sh

or change your current folder and start your script inside this folder:

cd /path/to/your
sh script.sh

Comments

[AlexGreg]

ls -l to where your script resides?

[steeldriver]

FYI sh does not "execute the script in bash" - it executes it in sh, which by default is dash on Ubuntu systems: see DashAsBinSh