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Making a Script Executable

You'll frequently write your own scripts, or download them from the internet, only to find that they refuse to run:

$ ./conquerworld.sh
bash: ./conquerworld.sh: Permission denied

This happens all the time, and it trips people up constantly. The code is fine and the file is right there, but it's missing the execute permission. The fix is a one-liner: add the execute bit with chmod +x. I use chmod +x all the time as a developer.

Linux Permissions

Owner can read, and write.

Symbolic

-rw-r--r--

Octal

06 4 4

chmod +x conquerworld.sh
./conquerworld.sh
# it works!

The internet is a shady place. Only make executable (and run) scripts from publishers and authors you trust.

Assignment

We just added execute permission to the genids.sh script in worldbanc/private/bin.

Change into the worldbanc/private/bin directory.
Remove the execute permission with chmod -x genids.sh.
Try to run the script with ./genids.sh. You'll get a permission denied error.
Give it back the execute permission with chmod +x genids.sh.
Run ./genids.sh again. This time it should print a list of generated IDs.

Paste the output of the script into the input field and submit your answer.