how to execute command after current running command in bash?

Solution 1:

You can do something like this:

1. stop execution of wget with ctrl-z (it's not stopped, it's suspended)
2. put it into background (bg)
3. run: wait; shutdown -h now

wait will wait for all programs ran in background from current shell - i.e. this wget.

After wait will finish - shutdown will go on.

Solution 2:

In another shell, use

ps -u <your username> | grep wget

to find the PID of the command you want to wait on, then

wait <PID>; shutdown -h now

so that shutdown will not run until process has terminated. See also depesz's answer.

Solution 3:

My solutions is this: suspend your long-running task with Control+Z, then type something like:

fg; echo "Done!"

If you want to run react differently based on the success or failure of your command, use && and || as short-circuit operators.

fg && echo "Success!" || echo "Failure!"

EDIT: This won't work with sudo, because it will ask for your password. I have, accordingly, removed the examples using sudo. If you need sudo for the second task, use another of the methods posted here.

On the other hand, I believe that both GNOME and KDE offer ways to trigger a shutdown/reboot without using sudo, by sending an appropriate D-Bus signal or something.