Im currently logged in as admin and I want to edit the /etc/hosts file which required root access.
I’m not able to make the changes. The script gets executed sucessfully but the changes arent made.
My Script – Runs Sucessfully when executed from terminal
sudo -s echo "127.0.0.1" >> /etc/hosts su admin
sudo -s – switches to root without password when executed from terminal
su admin – switches back to admin user when run on terminal
My /etc/hosts file remains empty after running the script
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Answer
There is no need to actually switch your user within the script.
Also, you can’t echo something as root like that because the redirect (>>) is executed by the shell.
A possible workaround is using tee:
echo "127.0.0.1" | sudo tee -a /etc/hosts
Further explanation:
tee basically takes the data from the standard input and writes it either to the standard output, or to a file. For more information see the commands manual ($ man tee)