usually immediately enables a newly
installed binary to be found in the
executable path.
With some shells, it will
ask you for a corrected similar name
before automagically finding the
not-yet-rehashed correct binary.
In general, the only restart needed is when lets say you have recompiled the kernel and you want the new kernel to work. In your case no restart is needed, but in order to use it right away in the shell you might need to do what jb_fvwm2 said.
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