为什么直接执行/ shell / bin / sh或/ usr / bin / bash时，shell脚本不能运行？

Question

Shell script file dummy.sh with -rw-r--r-- permission, runs fine with below commands.

/usr/bin/sh dummy.sh

(OR)

/usr/bin/bash dummy.sh

But ends up with bash: ./dummy.sh: Permission denied error, when executed directly as below. What's the reason behind this?

./dummy.sh

Answer 1

Your Script needs to be marked as executable for your system. This is done by setting the "x" bit for either the owner, the group or the rest of the world. See: Wikipedia - Unix permissions By executing

chmod 755 dummy.sh

you will set read, write and execute permissions for the owner of the script and read and execute permissions for the group and the rest of the world.

Answer 2

Provide "execute" permission to your shell script, using either of the following options:

1. chmod 744 dummy.sh
2. chmod u+x dummy.sh

Do refer to chmod documentation