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.TH OS 1 hosted
.SH NAME
os \- interface to host OS commands (hosted Inferno only)
.SH SYNOPSIS
.B bind -a '#C' /
.br
.B os
[
.B -m
.I mountpoint
] [
.BI -d " dir"
] [
.B -n
] [
.BI -N " level"
]
.I cmd
[
.IR arg ...
]
.SH DESCRIPTION
.I Os
uses a
.IR cmd (3)
device to execute a command,
.IR cmd ,
on a host system.
If the
.B -m
option is given,
.I os
uses the device at
.IR mountpoint ,
otherwise it is asssumed to be at
.BR /cmd ,
and is bound into the local namespace if necessary.
.PP
The
.B -d
option causes the command to run in directory
.IR dir ;
an error results and the command will not run if
.I dir
does not exist or is inaccessible.
The standard output and standard error of the command are merged on the standard output.
.I Os
copies the standard input to the remote command's standard input; redirect
.IR os 's
input to
.B /dev/null
if there is no input to the command.
.I Os
terminates when
.I cmd
does, and its exit status reflects the status of
.I cmd
(if available).
The
.B -n
option causes
.I cmd
to run with less than normal priority (`nice').
The
.B -N
option sets low priority to a particular
.I level
from 1 to 3.
.SH FILES
.B /cmd/clone
.SH SOURCE
.B /appl/cmd/os.b
.SH "SEE ALSO"
.IR cpu (1),
.IR rcmd (1),
.IR cmd (3)
.SH DIAGNOSTICS
The exit status of
.I os
reflects any error that occurs when starting
.I cmd
and, if it starts successfully, the status of
.I os
is the exit status of
.IR cmd .
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