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S_false Value

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The exit command terminates a script, just as in a C program. It can also return a value, which is available to the script's parent process.

Every command returns an exit status (sometimes referred

Hresult C#

to as a return status or exit code). A successful command returns

Hresult C++

a 0, while an unsuccessful one returns a non-zero value that usually can be interpreted as an error code. Well-behaved UNIX commands, decode hresult programs, and utilities return a 0 exit code upon successful completion, though there are some exceptions.

Likewise, functions within a script and the script itself return an exit status. The last command executed in the function or script https://msdn.microsoft.com/en-us/library/windows/desktop/aa378137(v=vs.85).aspx determines the exit status. Within a script, an exit nnn command may be used to deliver an nnn exit status to the shell (nnn must be an integer in the 0 - 255 range).

When a script ends with an exit that has no parameter, the exit status of the script is the exit status of the last command executed in the script (previous to the exit).

#!/bin/bash http://tldp.org/LDP/abs/html/exit-status.html COMMAND_1 . . . COMMAND_LAST # Will exit with status of last command. exit

The equivalent of a bare exit is exit $? or even just omitting the exit.

#!/bin/bash COMMAND_1 . . . COMMAND_LAST # Will exit with status of last command. exit $?

#!/bin/bash COMMAND1 . . . COMMAND_LAST # Will exit with status of last command.

$? reads the exit status of the last command executed. After a function returns, $? gives the exit status of the last command executed in the function. This is Bash's way of giving functions a "return value." [1]

Following the execution of a pipe, a $? gives the exit status of the last command executed.

After a script terminates, a $? from the command-line gives the exit status of the script, that is, the last command executed in the script, which is, by convention, 0 on success or an integer in the range 1 - 255 on error.

Example 6-1. exit / exit status

#!/bin/bash echo hello echo $? # Exit status 0 returned because command executed successfully. lskdf # Unrecognized command. echo $? # Non-zero exit status returned -- command failed to execute. echo exit 113 # Will return 113 to shell. # To verify this, type "echo $?" after sc

DESCRIPTION top The header file defines the integer variable errno, which is set by system calls and some library functions in the event of an error to http://man7.org/linux/man-pages/man3/errno.3.html indicate what went wrong. Its value is significant only when the return value of the call indicated an error (i.e., -1 from most system calls; -1 or NULL from most library functions); a function that succeeds is allowed to change errno. Valid error numbers are all nonzero; errno is never set to zero by any system call or library function. For some system calls and library functions (e.g., getpriority(2)), -1 is a valid return on success. hresult values In such cases, a successful return can be distinguished from an error return by setting errno to zero before the call, and then, if the call returns a status that indicates that an error may have occurred, checking to see if errno has a nonzero value. errno is defined by the ISO C standard to be a modifiable lvalue of type int, and must not be explicitly declared; errno may be a macro. errno is thread-local; setting error success value it in one thread does not affect its value in any other thread. All the error names specified by POSIX.1 must have distinct values, with the exception of EAGAIN and EWOULDBLOCK, which may be the same. Below is a list of the symbolic error names that are defined on Linux. Some of these are marked POSIX.1, indicating that the name is defined by POSIX.1-2001, or C99, indicating that the name is defined by C99. E2BIG Argument list too long (POSIX.1) EACCES Permission denied (POSIX.1) EADDRINUSE Address already in use (POSIX.1) EADDRNOTAVAIL Address not available (POSIX.1) EAFNOSUPPORT Address family not supported (POSIX.1) EAGAIN Resource temporarily unavailable (may be the same value as EWOULDBLOCK) (POSIX.1) EALREADY Connection already in progress (POSIX.1) EBADE Invalid exchange EBADF Bad file descriptor (POSIX.1) EBADFD File descriptor in bad state EBADMSG Bad message (POSIX.1) EBADR Invalid request descriptor EBADRQC Invalid request code EBADSLT Invalid slot EBUSY Device or resource busy (POSIX.1) ECANCELED Operation canceled (POSIX.1) ECHILD No child processes (POSIX.1) ECHRNG Channel number out of range ECOMM Communication error on send ECONNABORTED Connection aborted (POSIX.1) ECONNREFUSED Connection refused (POSIX.1) ECONNRESET Connection reset (POSIX.1) EDEADLK Resource deadlock avoided (POSIX.1) EDEADLOCK Synonym for EDEADLK EDESTADDRREQ Destination address required (POSIX.1) EDOM Mathematics argument out of domain of function (POSIX.1, C99) EDQUOT Disk quota exceeded (POSIX.1) EEXIST File exists (POSIX.1) EFAULT Bad address (POSIX.1) EFBIG File too

 

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