Command to check if the user is logged in?

[chrisdaggett]

I am making a simple bash script. I want to use an IF statement that checks to make sure the user is logged in before it runs (else Exit).

Anyone know what command line to use to make sure the computer is not at the login window, or that a user is logged in?

Thanks in advance.

[maxbehr · Accepted solution]

Agree, I'm sure there is probably a more elegant way but I just use

who | grep "console"

if that returns anything then you know a user is logged in.

[bvrooman]

You can gather that information from who. There might be a better way to do it, though.

[maxbehr · Accepted solution]

Agree, I'm sure there is probably a more elegant way but I just use

who | grep "console"

if that returns anything then you know a user is logged in.

[iJake · Accepted solution]

currentUser=$(stat -f %Su "/dev/console")

if [[ "$currentUser" == "root" ]]; then
exit
fi

[chrisdaggett]

Thanks all :).