72 lines
1.7 KiB
Groff
72 lines
1.7 KiB
Groff
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.TH INTR 8
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.SH NAME
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intr \- run a command with interrupts enabled
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.SH SYNOPSIS
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.B intr
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.RB [ \-d ]
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.RB [ \-t
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.IR seconds ]
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.I command
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.RI [arg "...]"
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.SH DESCRIPTION
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.B Intr
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executes a command with keyboard interrupts enabled, and standard input,
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output and error redirected to the terminal or the console. It may also
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be used for the opposite: to detach a process from the terminal.
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.PP
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There are three situations where intr may be used: From a process that has
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no controlling tty, like the shell running
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.B /etc/rc
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at boot time, from a script that runs in the background, or by the System
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Administrator to restart a daemon.
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.PP
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In the first case
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.B intr
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will use
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.B /dev/console
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as a controlling tty and as standard input, output and error. In the
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second case
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.B intr
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will use
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.B /dev/tty
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to connect the command to the controlling tty. In the third case the
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process will be removed from the process group, and will have I/O redirected
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to
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.B /dev/null
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as input, and
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.B /dev/log
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for output.
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.SH OPTIONS
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.TP
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.B \-d
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Daemonize a process instead of bringing it to the foreground. Don't forget
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to use '&' to make the shell not wait for the process, because you won't be
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able to kill it with the interrupt key.
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.TP
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.BI \-t " seconds"
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Schedule an alarm to kill the process in the given number of seconds.
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Use it for a process that may wait indefinitely for a service that may
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not be available.
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.SH FILES
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.TP 20
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.B /dev/console
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Main computer console.
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.TP
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.B /dev/log
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Message logging device.
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.TP
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.B /dev/tty
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Name for the controlling tty.
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.SH "SEE ALSO"
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.BR boot (8),
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.BR tty (4),
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.BR setsid (2),
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.BR alarm (2).
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.SH BUGS
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Maybe
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.B intr \-d
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should fork to daemonize a process, but the author likes it if the process
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stays in the jobs list of his shell.
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.SH AUTHOR
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Kees J. Bot (kjb@cs.vu.nl)
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