Annotation of src/usr.bin/at/at.1, Revision 1.6
1.6 ! deraadt 1: .\" $OpenBSD: at.1,v 1.5 1998/02/12 18:24:50 marc Exp $
1.4 millert 2: .\" $FreeBSD: at.man,v 1.6 1997/02/22 19:54:05 peter Exp $
3: .Dd April 12, 1995
1.1 deraadt 4: .Dt "AT" 1
1.3 michaels 5: .Os
1.1 deraadt 6: .Sh NAME
7: .Nm at, batch, atq, atrm
1.4 millert 8: .Nd queue, examine or delete jobs for later execution
1.1 deraadt 9: .Sh SYNOPSIS
10: .Nm at
1.4 millert 11: .Op Fl V
1.1 deraadt 12: .Op Fl q Ar queue
13: .Op Fl f Ar file
1.4 millert 14: .Op Fl mldbv
1.1 deraadt 15: .Ar time
16: .Pp
1.4 millert 17: .Nm at
18: .Op Fl V
19: .Fl c Ar job Op Ar job ...
20: .Pp
1.1 deraadt 21: .Nm atq
1.4 millert 22: .Op Fl V
1.1 deraadt 23: .Op Fl q Ar queue
24: .Op Fl v
25: .Pp
26: .Nm atrm
1.4 millert 27: .Op Fl V
1.1 deraadt 28: .Ar job
29: .Op Ar job ...
30: .Pp
31: .Nm batch
1.4 millert 32: .Op Fl V
33: .Op Fl q Ar queue
1.1 deraadt 34: .Op Fl f Ar file
1.4 millert 35: .Op Fl mv
36: .Op Ar time
1.1 deraadt 37: .Sh DESCRIPTION
1.4 millert 38: .Nm At
1.1 deraadt 39: and
40: .Nm batch
1.4 millert 41: read commands from standard input or a specified file which
42: are to be executed at a later time, using
1.1 deraadt 43: .Xr sh 1 .
44: .Bl -tag -width indent
45: .It Nm at
46: Executes commands at a specified time.
47: .It Nm atq
1.4 millert 48: Lists the user's pending jobs, unless the user is the superuser.
49: In that case, everybody's jobs are listed.
1.1 deraadt 50: .It Nm atrm
51: Deletes jobs.
52: .It Nm batch
1.4 millert 53: Executes commands when system load levels permit. In other words, when
54: the load average drops below 1.5, or the value specified in the invocation of
55: .Nm atrun .
1.1 deraadt 56: .El
57: .Pp
58: .Nm At
1.4 millert 59: allows some moderately complex
60: .Ar time
61: specifications. It accepts times of the form
1.1 deraadt 62: .Ar HHMM
63: or
64: .Ar HH:MM
1.4 millert 65: to run a job at a specific time of day.
66: (If that time is already past, the next day is assumed.)
1.1 deraadt 67: You may also specify
68: .Nm midnight ,
69: .Nm noon ,
70: or
71: .Nm teatime
1.4 millert 72: (4pm)
73: and you can have a time-of-day suffixed with
1.1 deraadt 74: .Nm AM
75: or
76: .Nm PM
1.4 millert 77: for running in the morning or the evening.
78: You can also say what day the job will be run,
1.1 deraadt 79: by giving a date in the form
1.4 millert 80: .Ar \%month-name day
1.1 deraadt 81: with an optional
82: .Ar year ,
83: or giving a date of the form
1.4 millert 84: .Ar MMDDYY
85: or
1.1 deraadt 86: .Ar MM/DD/YY
87: or
88: .Ar DD.MM.YY .
1.4 millert 89: The specification of a date must follow the specification of
90: the time of day.
1.1 deraadt 91: You can also give times like
1.4 millert 92: .Op Nm now
93: .Nm + Ar count \%time-units ,
94: where the time-units can be
95: .Nm minutes ,
96: .Nm hours ,
97: .Nm days ,
1.1 deraadt 98: or
99: .Nm weeks
1.4 millert 100: and you can tell
101: .Nm at
102: to run the job today by suffixing the time with
1.1 deraadt 103: .Nm today
1.4 millert 104: and to run the job tomorrow by suffixing the time with
105: .Nm tomorrow.
106: .Pp
107: For example, to run a job at 4pm three days from now, you would do
108: .Nm at 4pm + 3 days ,
109: to run a job at 10:00am on July 31, you would do
110: .Nm at 10am Jul 31
111: and to run a job at 1am tomorrow, you would do
112: .Nm at 1am tomorrow.
113: .Pp
114: For both
115: .Nm at
116: and
117: .Nm batch ,
118: commands are read from standard input or the file specified
119: with the
120: .Fl f
121: option and executed.
122: The working directory, the environment (except for the variables
123: .Nm TERM ,
124: .Nm TERMCAP ,
125: .Nm DISPLAY
126: and
127: .Nm _ )
128: and the
129: .Ar umask
130: are retained from the time of invocation.
131: An
132: .Nm at
133: or
134: .Nm batch
135: command invoked from a
136: .Xr su 1
137: shell will retain the current userid.
138: The user will be mailed standard error and standard output from his
139: commands, if any. Mail will be sent using the command
140: .Xr sendmail 8 .
141: If
142: .Nm at
143: is executed from a
144: .Xr su 1
145: shell, the owner of the login shell will receive the mail.
146: .Pp
147: The superuser may use these commands in any case.
148: For other users, permission to use at is determined by the files
149: .Pa /var/at/at.allow
150: and
151: .Pa /var/at/at.deny .
152: .Pp
153: If the file
154: .Pa /var/at/at.allow
155: exists, only usernames mentioned in it are allowed to use
156: .Nm at .
157: .Pp
158: If
159: .Pa /var/at/at.allow
160: does not exist,
161: .Pa /var/at/at.deny
162: is checked, every username not mentioned in it is then allowed
163: to use
164: .Nm at .
165: .Pp
166: If neither exists, only the superuser is allowed use of
167: .Nm at .
168: .Pp
169: An empty
170: .Pa /var/at/at.deny
171: means that every user is allowed use these commands.
1.5 marc 172: This is the default configuration.
1.4 millert 173: .Sh OPTIONS
174: .Bl -tag -width indent
175: .It Fl V
176: Prints the version number to standard error.
177: .It Fl q Ar queue
178: Uses the specified queue.
179: A queue designation consists of a single letter. Valid queue designations
180: range from
181: .Nm a
182: to
183: .Nm z
184: and
185: .Nm A
186: to
187: .Nm Z .
188: The
189: .Nm c
190: queue is the default for
191: .Nm at
192: and the
193: .Nm E
194: queue for
195: .Nm batch .
196: Queues with higher letters run with increased niceness.
197: If a job is submitted to a queue designated with an uppercase letter, it
198: is treated as if it had been submitted to batch at that time.
199: If
200: .Nm atq
201: is given a specific queue, it will only show jobs pending in that queue.
202: .It Fl m
203: Send mail to the user when the job has completed even if there was no
204: output.
205: .It Fl f Ar file
206: Reads the job from
207: .Ar file
208: rather than standard input.
209: .It Fl l
210: Is an alias for
211: .Nm atq.
212: .It Fl d
213: Is an alias for
214: .Nm atrm.
215: .It Fl b
216: Is an alias for
217: .Nm batch.
218: .It Fl v
219: For
220: .Nm atq ,
221: shows completed but not yet deleted jobs in the queue. Otherwise
222: shows the time the job will be executed.
223: .It Fl c
1.6 ! deraadt 224: Cats the jobs listed on the command line to standard output.
1.1 deraadt 225: .Sh FILES
1.4 millert 226: .Bl -tag -width /var/at/.lockfile -compact
1.1 deraadt 227: .It Pa /var/at/jobs
228: Directory containing job files
229: .It Pa /var/at/spool
230: Directory containing output spool files
1.4 millert 231: .It Pa /var/run/utmp
232: Login records
233: .It Pa /var/at/at.allow
234: Allow permission control
235: .It Pa /var/at/at.deny
236: Deny permission control
237: .It Pa /var/at/.lockfile
1.1 deraadt 238: Job-creation lock file.
239: .Sh SEE ALSO
240: .Xr cron 8 ,
241: .Xr nice 1 ,
1.4 millert 242: .Xr umask 2 ,
1.1 deraadt 243: .Xr sh 1 ,
1.4 millert 244: .Xr sendmail 8 ,
245: .Xr atrun 8 .
1.1 deraadt 246: .El
247: .Sh BUGS
248: .Pp
249: If the file
250: .Pa /var/run/utmp
1.4 millert 251: is not available or corrupted, or if the user is not logged on at the
252: time
1.1 deraadt 253: .Nm at
1.4 millert 254: is invoked, the mail is sent to the userid found
255: in the environment variable
1.1 deraadt 256: .Nm LOGNAME .
257: If that is undefined or empty, the current userid is assumed.
1.4 millert 258: .Pp
259: .Nm At
260: and
261: .Nm batch
262: as presently implemented are not suitable when users are competing for
263: resources.
264: If this is the case for your site, you might want to consider another
265: batch system, such as
266: .Nm nqs .
267: .Sh AUTHORS
268: At was mostly written by Thomas Koenig <ig25@rz.uni-karlsruhe.de>.
269: The time parsing routines are by David Parsons <orc@pell.chi.il.us>.
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