NAME
exit — cause the
shell to exit
SYNOPSIS
exit |
[n] |
DESCRIPTION
The exit utility shall cause the shell to
exit with the exit status
specified by the unsigned decimal integer n. If n is specified, but its
value is not between 0 and 255 inclusively, the exit
status is undefined.
A trap on
EXIT shall be
executed before the shell terminates, except when the
exit utility is invoked in that trap itself, in
which case the shell shall exit immediately.
EXIT STATUS
The exit status shall be n, if specified.
Otherwise, the value shall be the exit value of the
last command executed, or zero if no command was executed. When
exit is executed in a trap action (see
trap(1) ), the ‘‘last
command’’ is considered to be the command that executed
immediately preceding the trap action.
RATIONALE
As explained in other clauses, certain
exit status values have been reserved for special
uses and should be used by applications only for those purposes:
126 A file to be executed was found, but it was not an executable utility.
127 A utility to be executed was not found.
>128 A command was interrupted by a signal.
3.14 Special Built-in Utilities 251
Examples: Exit with a true value: exit 0
Exit with a false value: exit