system.3

操作系统设计与实现源码

.\"	@(#)system.3	6.1 (Berkeley) 5/15/85
.\"
.TH SYSTEM 3 "May 15, 1985"
.AT 3
.SH NAME
system \- issue a shell command
.SH SYNOPSIS
.nf
.ft B
#include <stdlib.h>

int system(const char *\fIstring\fP)
.fi
.SH DESCRIPTION
.B System
causes the
.I string
to be given to
.BR  sh (1)
as input as if the string had been typed as a command
at a terminal.
The current process waits until the shell has
completed, then returns the exit status of the shell.
.SH "SEE ALSO"
.BR sh (1),
.BR popen (3),
.BR execve (2),
.BR wait (2).
.SH DIAGNOSTICS
Exit status 127 indicates the shell couldn't be executed.