98 lines
1.6 KiB
Plaintext
98 lines
1.6 KiB
Plaintext
.TH OS 1
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.SH NAME
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os \- interface to host OS commands (drawterm only)
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.SH SYNOPSIS
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.B os
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[
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.B -b
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] [
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.B -m
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.I mountpoint
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] [
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.BI -d " dir"
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] [
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.B -n
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] [
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.BI -N " level"
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]
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.I cmd
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[
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.IR arg ...
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]
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.SH DESCRIPTION
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.I Os
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uses a
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.IR cmd (3)
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device to execute a command,
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.IR cmd ,
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on a host system.
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If the
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.B -m
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option is given,
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.I os
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uses the device at
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.IR mountpoint ,
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otherwise it is assumed to be at
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.BR /mnt/term/cmd .
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.PP
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The
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.B -d
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option causes the command to run in directory
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.IR dir ;
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an error results and the command will not run if
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.I dir
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does not exist or is inaccessible.
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The standard output and standard error of the command appear on the standard output
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and standard error streams of the
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.I os
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command itself.
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.I Os
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copies the standard input to the remote command's standard input; redirect
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.IR os 's
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input to
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.B /dev/null
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if there is no input to the command.
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.I Os
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terminates when
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.I cmd
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does, and its exit status reflects the status of
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.I cmd
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(if available).
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.PP
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If the
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.I os
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command is killed or exits (eg, for lack of input and output),
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the host's own process control operations are used to (attempt to) kill
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.IR cmd ,
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if it is still running.
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The
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.B -b
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(background) option suppresses that behaviour.
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.PP
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The
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.B -n
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option causes
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.I cmd
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to run with less than normal priority (`nice').
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The
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.B -N
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option sets low priority to a particular
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.I level
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from 1 to 3.
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.SH FILES
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.B /mnt/term/cmd/clone
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.SH SOURCE
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.B /sys/src/cmd/os.c
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.SH "SEE ALSO"
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.IR rcpu (1),
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.IR cmd (3)
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.SH DIAGNOSTICS
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The exit status of
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.I os
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reflects any error that occurs when starting
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.I cmd
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and, if it starts successfully, the status of
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.I os
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is the exit status of
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.IR cmd .
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