system.3f

来自「<B>Digital的Unix操作系统VAX 4.2源码</B>」· 3F 代码 · 共 39 行

.\" SCCSID: @(#)system.3f	8.1	9/11/90
.TH system 3f VAX "" Unsupported
.SH Name
system \- execute an ULTRIX command
.SH Syntax
.B integer function system (string)
.br
.B character*(*) string
.SH Description
.NXR "system subroutine (FORTRAN)"
.NXR "shell command" "issuing"
The
.PN system
routine causes
.I string
to be given to your shell
as input as if the string had been typed as a command.
If environment variable SHELL
is found, its value will be used as the command interpreter (shell);
otherwise 
.MS 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 
.MS wait 2
for an explanation of this value.
.SH Restrictions
The
.I string
cannot be longer than NCARGS\_R50 characters, as defined in
<sys/param.h>.
.SH Files
.ie \nM /usr/ucb/lib/libU77.a
.el /usr/lib/libU77.a
.SH See Also
execve(2), wait(2), system(3)