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Switch to root user within bash script

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)

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