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67 lines
2.0 KiB
Plaintext
67 lines
2.0 KiB
Plaintext
NAME
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system - issue a shell command
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SYNOPSIS
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system(cmd)
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TYPES
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cmd str
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return int
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DESCRIPTION
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This function executes the shell command found in the string, cmd.
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The return value is system dependent. On POSIX P1003.1 compliant
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systems the return value is defined by the waitpid system call.
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Typically a shell command that returns with a 0 exit status will
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cause this function to return a 0 value. On some systems, a shell
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command that returns with an exit status of e will cause this
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function to return e*256. Core dumps, termination due to signals
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and other waitpid values will change the return value.
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On POSIX P1003.1 compliant systems, if cmd is empty then this function
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will determine if the shell is executable. If the shell is executable,
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0 is returned otherwise non-zero is returned.
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EXAMPLE
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; system("")
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0
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; system("true")
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0
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; system("exit 2")
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512
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; system("date")
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Sun Jul 9 03:21:48 PDT 1995
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0
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LIMITS
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none
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LINK LIBRARY
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none
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SEE ALSO
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cmdbuf, argv
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## Copyright (C) 1999-2006,2021 Landon Curt Noll
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##
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## Calc is open software; you can redistribute it and/or modify it under
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## the terms of the version 2.1 of the GNU Lesser General Public License
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## as published by the Free Software Foundation.
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##
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## Calc is distributed in the hope that it will be useful, but WITHOUT
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## ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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## or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General
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## Public License for more details.
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##
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## A copy of version 2.1 of the GNU Lesser General Public License is
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## distributed with calc under the filename COPYING-LGPL. You should have
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## received a copy with calc; if not, write to Free Software Foundation, Inc.
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## 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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##
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## Under source code control: 1995/07/09 03:48:57
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## File existed as early as: 1995
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##
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## chongo <was here> /\oo/\ http://www.isthe.com/chongo/
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## Share and enjoy! :-) http://www.isthe.com/chongo/tech/comp/calc/
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