“command not found” when running shell script

问题

Here is the simple script.sh file I have:

#!/bin/bash
pwd
date
ls -lg

I have used chmod +x to make the file executable, but when running it with ./script.sh I get command not found: pwd command not found: date and only the ls -lg command works. I'm a bit perplexed as to why the first two commands aren't working because when I type them into the command terminal they work the way they should.

回答1:

Maybe there is a (invisible) character there that should not be there. Try typing it again from scratch in the environment that it will run (ex: Linux) or use this command od -c /folder/script.sh to reveal those pesky characters.

回答2:

Also do not use a variable called PATH (cause it is already used :)

来源：https://stackoverflow.com/questions/43771597/command-not-found-when-running-shell-script