如何在Shell脚本中执行sudo命令？

Question

I am using the LaunchD Task Scheduler app to schedule jobs on my Mac Mini. I would like to execute the purge command every two hours so I won't have to remember to do this in the terminal. I have to run this using the sudo command. I want to do this in a way that protects my password.

I have found a lot of different ways to accomplish this with a lot of debate about the solutions. I decided for now to run the following script. From my understanding this should keep the command from being written in .bash_history and in cache files. Right now the permissions for the folder where I have my scripts (and each script) are set to admins & current user having access.

#!/bin/sh
export HISTIGNORE='*sudo -S*'
echo "mypassword" | sudo -S -k purge

I have read about a process where I could put a password in a secure file and I guess access the password from that file. I would like to try that process but I could not find an example of how to do this. I'm thinking that referencing one secure file with the password may be better than putting the password in each shell script. I would also like to see the command in .bash_history.

Answer 1

The safe way to do this is to allow the user to run a specific command without a password.

See this question from one of StackOverflow's sister sites.

Answer 2

You want a script to run, as root, every 2 hours so you do not need to remember?

sudo crontab -e

0 0,2,4,6,8,10,12,14,16,18,20,22 * * * /home/lightbe/swanky_script.sh

...and then your password is protected.