will open the file given by the command line argument and serially
execute all the commands in it. If a command fails, the whole batch job
is aborted (unless -c is given as first paramter on the serdo command
serdo understands the cd and exportsh(1) built-ins (no
loops, no ~user expansion, no $FOO expansion, no backticks).
serdo is very limited by design, but it is nice to have if you just want
to run a few ifconfig, ip, route commands in sequence. serdo will
return the exit code of the last command it ran, 0 if none were given.