1993-08-02 21:48:44 +04:00
|
|
|
.\" -*- nroff -*-
|
|
|
|
|
.\"
|
|
|
|
|
.\" Copyright 1988,1990 by Paul Vixie
|
|
|
|
|
.\" All rights reserved
|
|
|
|
|
.\"
|
|
|
|
|
.\" Distribute freely, except: don't remove my name from the source or
|
|
|
|
|
.\" documentation (don't take credit for my work), mark your changes (don't
|
|
|
|
|
.\" get me blamed for your possible bugs), don't alter or remove this
|
|
|
|
|
.\" notice. May be sold if buildable source is provided to buyer. No
|
|
|
|
|
.\" warrantee of any kind, express or implied, is included with this
|
|
|
|
|
.\" software; use at your own risk, responsibility for damages (if any) to
|
|
|
|
|
.\" anyone resulting from the use of this software rests entirely with the
|
|
|
|
|
.\" user.
|
|
|
|
|
.\"
|
|
|
|
|
.\" Send bug reports, bug fixes, enhancements, requests, flames, etc., and
|
|
|
|
|
.\" I'll try to keep a version up to date. I can be reached as follows:
|
|
|
|
|
.\" Paul Vixie, 329 Noe Street, San Francisco, CA, 94114, (415) 864-7013,
|
|
|
|
|
.\" paul@vixie.sf.ca.us || {hoptoad,pacbell,decwrl,crash}!vixie!paul
|
|
|
|
|
.\"
|
|
|
|
|
.\" $Id: crond.8,v 1.3 1993/08/02 17:50:21 mycroft Exp $
|
|
|
|
|
.\"
|
1993-03-21 12:45:37 +03:00
|
|
|
.TH CROND 8 "15 Nov 1988"
|
|
|
|
|
.UC 4
|
|
|
|
|
.SH NAME
|
|
|
|
|
crond \- daemon to execute scheduled commands (Vixie Cron)
|
|
|
|
|
.SH SYNOPSIS
|
|
|
|
|
crond
|
|
|
|
|
.SH DESCRIPTION
|
|
|
|
|
.I Crond
|
|
|
|
|
should be started from /etc/rc or /etc/rc.local. It will return immediately,
|
|
|
|
|
so you don't need to start it with '&'.
|
|
|
|
|
.PP
|
|
|
|
|
.I Crond
|
|
|
|
|
searches /var/cron/tabs for crontab files which are named after accounts in
|
|
|
|
|
/etc/passwd; crontabs found are loaded into memory.
|
|
|
|
|
.I Crond
|
|
|
|
|
then wakes up every minute, examining all stored crontabs, checking each
|
|
|
|
|
command to see if it should be run in the current minute. When executing
|
|
|
|
|
commands, any output is mailed to the owner of the crontab (or to the user
|
|
|
|
|
named in the MAILTO environment variable in the crontab, if such exists).
|
|
|
|
|
.PP
|
|
|
|
|
Additionally,
|
|
|
|
|
.I crond
|
|
|
|
|
checks each minute to see if its spool directory's modtime has changed, and
|
|
|
|
|
if it has,
|
|
|
|
|
.I crond
|
|
|
|
|
will then examine the modtime on all crontabs and reload those which have
|
|
|
|
|
changed. Thus
|
|
|
|
|
.I crond
|
|
|
|
|
need not be restarted whenever a crontab file is modified. Note that the
|
|
|
|
|
.IR Crontab (1)
|
|
|
|
|
command updates the modtime of the spool directory whenever it changes a
|
|
|
|
|
crontab.
|
|
|
|
|
.SH "SEE ALSO"
|
|
|
|
|
crontab(1), crontab(5)
|
|
|
|
|
.SH AUTHOR
|
|
|
|
|
.nf
|
|
|
|
|
Paul Vixie, paul@vixie.sf.ca.us
|
