xargs [option...] [command [initial-arguments]]
xargs exits with the following status:
- if it succeeds
- if any invocation of the command exited with status 1-125
- if the command exited with status 255
- if the command is killed by a signal
- if the command cannot be run
- if the command is not found
- if some other error occurred.
Exit codes greater than 128 are used by the shell to indicate that
a program died due to a fatal signal.