my $username = `usermod -l $nname $name`;
my $dirusername = `usermod -d /home/$nname -m $nname`;

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I would recommend against this way of doing this because it allows for injection of arbitrary shell commands via $nname and $name, and it does not check for errors in the commands. See also.

In reply to Re^2: Linux::usermod - user name ... already exists by haukex
in thread Linux::usermod - user name ... already exists by mldvx4

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