4.4BSD/usr/src/share/man/man3f/system.3

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.\" Copyright (c) 1983, 1993
.\"	The Regents of the University of California.  All rights reserved.
.\"
.\" This module is believed to contain source code proprietary to AT&T.
.\" Use and redistribution is subject to the Berkeley Software License
.\" Agreement and your Software Agreement with AT&T (Western Electric).
.\"
.\"	@(#)system.3	8.1 (Berkeley) 6/5/93
.\"
.TH SYSTEM 3F "June 5, 1993"
.UC 5
.SH NAME
system \- execute a \s-2UNIX\s0 command
.SH SYNOPSIS
.B integer function system (string)
.br
.B character*(*) string
.SH DESCRIPTION
.I System
causes
.I string
to be given to your shell
as input as if the string had been typed as a command.
If environment variable
.B SHELL
is found, its value will be used as the command interpreter (shell);
otherwise
.IR sh (1)
is used.
.PP
The current process waits until the command terminates.
The returned value will be the exit status of the shell.
See
.IR wait (2)
for an explanation of this value.
.SH FILES
.ie \nM /usr/ucb/lib/libU77.a
.el /usr/lib/libU77.a
.SH "SEE ALSO"
exec(2), wait(2), system(3)
.SH BUGS
.I String
can not be longer than NCARGS\-50 characters, as defined in
.RI < sys/param.h >.