- introduction to system maintenance procedures and commands
This section contains information related to system operation
It describes commands used to create new file systems
verify the integrity of the file systems
control disk usage
maintain system backups
and recover files when disks die an untimely death
Network related services like
are also described.
All commands set an exit status.
Its value may be tested
to see if the command completed normally.
Unless otherwise noted (rare), the value 0 signifies successful
completion of the command, while a value >0 indicates an error.
Some commands attempt to describe the nature of the failure by using
error codes defined in
or set the status to arbitrary values >0 (typically 1), but many
such values are not described in the manual.
A number of pages in this section describe general system
For example, the
manual page describes the system bootstrapping procedures,
manual page describes how to boot a system over a network.
should be consulted to understand how to interpret system