Партнёры:
Хостинг:
exit, return, goto - shell built-in functions to enable the execution of the shell to advance beyond its sequence of steps
exit [n]
return [n]
exit [( expr )]
goto label
*exit [n]
*return [n]
+exit [n]
+return [n]
exit causes the calling shell or shell script to exit with the exit status specified by n. If n is omitted the exit status is that of the last command executed (an EOF also causes the shell to exit.)
return causes a function to exit with the return value specified by n. If n is omitted, the return status is that of the last command executed.
exit causes the calling shell or shell script to exit, either with the value of the status variable or with the value specified by the expression expr.
The goto built-in uses a specified label as a search string amongst commands. The shell rewinds its input as much as possible and searches for a line of the form label: possibly preceded by space or tab characters. Execution continues after the indicated line. It is an error to jump to a label that occurs between a while or for built-in command and its corresponding end.
exit causes the calling shell or shell script to exit with the exit status specified by n. The value is the least significant 8 bits of the specified status. If n is omitted then the exit status is that of the last command executed. When exit occurs when executing a trap, the last command refers to the command that executed before the trap was invoked. An end-of-file also causes the shell to exit except for a shell which has the ignoreeof option (See set below) turned on.
return causes a shell function or '.' script to return to the invoking script with the return status specified by n. The value is the least significant 8 bits of the specified status. If n is omitted then the return status is that of the last command executed. If return is invoked while not in a function or a '.' script, then it is the same as an exit.
On this man page, ksh(1) commands that are preceded by one or two * (asterisks) are treated specially in the following ways:
exit is shell special built-in that causes the shell that invokes it to exit. Before exiting the shell, if the EXIT trap is set, it is invoked.
If n is specified, it is used to set the exit status.
return is a shell special built-in that causes the function or dot script that invokes it to exit. If return is invoked outside of a function or dot script it is equivalent to exit.
If return is invoked inside a function defined with the function reserved word syntax, then any EXIT trap set within the function is invoked in the context of the caller before the function returns.
If n is specified, it is used to set the exit status.
On this manual page, ksh93 commands that are preceded by one or two + symbols are special built-in commands and are treated specially in the following ways:
If n is specified for exit, the exit status is the least significant eight bits of the value of n. Otherwise, the exit status is the exit status of preceding command. When invoked inside a trap, the preceding command means the command that invoked the trap.
If n is specified for return, the exit status is the least significant eight bits of the value of n. Otherwise, the exit status is the exit status of preceding command.
See attributes(5) for descriptions of the following attributes:
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break(1), csh(1), ksh(1), ksh93(1), sh(1), attributes(5)
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