Annotation of src/usr.bin/at/at.1, Revision 1.10
1.10 ! aaron 1: .\" $OpenBSD: at.1,v 1.9 1999/03/21 04:04:41 alex Exp $
1.4 millert 2: .\" $FreeBSD: at.man,v 1.6 1997/02/22 19:54:05 peter Exp $
3: .Dd April 12, 1995
1.7 aaron 4: .Dt AT 1
1.3 michaels 5: .Os
1.1 deraadt 6: .Sh NAME
1.7 aaron 7: .Nm at, atq, atrm, batch
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
1.4 millert 16: .Nm at
17: .Op Fl V
18: .Fl c Ar job Op Ar job ...
1.1 deraadt 19: .Nm atq
1.4 millert 20: .Op Fl V
1.1 deraadt 21: .Op Fl q Ar queue
22: .Op Fl v
23: .Nm atrm
1.4 millert 24: .Op Fl V
1.1 deraadt 25: .Ar job
26: .Op Ar job ...
27: .Nm batch
1.4 millert 28: .Op Fl V
29: .Op Fl q Ar queue
1.1 deraadt 30: .Op Fl f Ar file
1.4 millert 31: .Op Fl mv
32: .Op Ar time
1.1 deraadt 33: .Sh DESCRIPTION
1.7 aaron 34: .Nm at
1.1 deraadt 35: and
36: .Nm batch
1.4 millert 37: read commands from standard input or a specified file which
38: are to be executed at a later time, using
1.1 deraadt 39: .Xr sh 1 .
40: .Bl -tag -width indent
41: .It Nm at
42: Executes commands at a specified time.
43: .It Nm atq
1.4 millert 44: Lists the user's pending jobs, unless the user is the superuser.
1.7 aaron 45: In that case, all users' jobs are listed.
1.1 deraadt 46: .It Nm atrm
47: Deletes jobs.
48: .It Nm batch
1.4 millert 49: Executes commands when system load levels permit. In other words, when
50: the load average drops below 1.5, or the value specified in the invocation of
51: .Nm atrun .
1.1 deraadt 52: .El
53: .Pp
1.7 aaron 54: .Nm at
1.4 millert 55: allows some moderately complex
56: .Ar time
57: specifications. It accepts times of the form
1.1 deraadt 58: .Ar HHMM
59: or
60: .Ar HH:MM
1.4 millert 61: to run a job at a specific time of day.
62: (If that time is already past, the next day is assumed.)
1.1 deraadt 63: You may also specify
64: .Nm midnight ,
65: .Nm noon ,
66: or
67: .Nm teatime
1.4 millert 68: (4pm)
69: and you can have a time-of-day suffixed with
1.1 deraadt 70: .Nm AM
71: or
72: .Nm PM
1.4 millert 73: for running in the morning or the evening.
74: You can also say what day the job will be run,
1.1 deraadt 75: by giving a date in the form
1.4 millert 76: .Ar \%month-name day
1.1 deraadt 77: with an optional
78: .Ar year ,
79: or giving a date of the form
1.7 aaron 80: .Ar MMDDYY ,
1.1 deraadt 81: .Ar MM/DD/YY
82: or
83: .Ar DD.MM.YY .
1.9 alex 84: The year may be given as two digits or four digits.
85: If the year is given as two digits, it is taken to occur as soon as
86: possible in the future, which may be in the next century --
87: unless it's last year, in which case it's considered to be
88: a typo.
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
1.8 aaron 105: .Nm tomorrow .
1.4 millert 106: .Pp
107: For example, to run a job at 4pm three days from now, you would do
1.7 aaron 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: To run a job at 1am tomorrow, you would do
1.8 aaron 112: .Nm at 1am tomorrow .
1.4 millert 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
1.7 aaron 123: .Ev TERM ,
124: .Ev TERMCAP ,
125: .Ev DISPLAY ,
1.4 millert 126: and
1.7 aaron 127: .Ev _ )
1.4 millert 128: and the
129: .Ar umask
130: are retained from the time of invocation.
131: An
132: .Nm at
133: or
134: .Nm batch
1.10 ! aaron 135: command invoked from a
1.4 millert 136: .Xr su 1
1.7 aaron 137: shell will retain the current user ID.
1.4 millert 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
1.10 ! aaron 143: is executed from a
1.4 millert 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
1.7 aaron 162: is checked. Every username not mentioned in it is then allowed
1.4 millert 163: to use
164: .Nm at .
165: .Pp
166: If neither exists, only the superuser is allowed use of
167: .Nm at .
168: .Pp
1.10 ! aaron 169: An empty
1.4 millert 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
1.10 ! aaron 182: to
1.4 millert 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
1.7 aaron 203: Send mail to the user when the job has completed, even if there was no
1.4 millert 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
1.7 aaron 211: .Nm atq .
1.4 millert 212: .It Fl d
213: Is an alias for
1.7 aaron 214: .Nm atrm .
1.4 millert 215: .It Fl b
216: Is an alias for
1.7 aaron 217: .Nm batch .
1.4 millert 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
1.7 aaron 224: Prints 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
1.7 aaron 228: directory containing job files
1.1 deraadt 229: .It Pa /var/at/spool
1.7 aaron 230: directory containing output spool files
1.4 millert 231: .It Pa /var/run/utmp
1.7 aaron 232: login records
1.4 millert 233: .It Pa /var/at/at.allow
1.7 aaron 234: allow permission control
1.4 millert 235: .It Pa /var/at/at.deny
1.7 aaron 236: deny permission control
1.4 millert 237: .It Pa /var/at/.lockfile
1.7 aaron 238: job-creation lock file
1.1 deraadt 239: .Sh SEE ALSO
240: .Xr nice 1 ,
1.7 aaron 241: .Xr sh 1 ,
1.4 millert 242: .Xr umask 2 ,
1.7 aaron 243: .Xr atrun 8 ,
244: .Xr cron 8 ,
245: .Xr sendmail 8
1.1 deraadt 246: .El
247: .Sh BUGS
248: If the file
249: .Pa /var/run/utmp
1.4 millert 250: is not available or corrupted, or if the user is not logged on at the
1.10 ! aaron 251: time
1.1 deraadt 252: .Nm at
1.7 aaron 253: is invoked, the mail is sent to the user ID found
1.4 millert 254: in the environment variable
1.7 aaron 255: .Ev LOGNAME .
256: If that is undefined or empty, the current user ID is assumed.
1.4 millert 257: .Pp
1.7 aaron 258: .Nm at
1.4 millert 259: and
260: .Nm batch
261: as presently implemented are not suitable when users are competing for
262: resources.
263: If this is the case for your site, you might want to consider another
264: batch system, such as
265: .Nm nqs .
266: .Sh AUTHORS
1.7 aaron 267: .Nm at
268: was mostly written by Thomas Koenig <ig25@rz.uni-karlsruhe.de>.
1.4 millert 269: The time parsing routines are by David Parsons <orc@pell.chi.il.us>.
![[BACK]](/icons/back.gif){kind=icon}
Return to at.1 CVS log ![[TXT]](/icons/text.gif){kind=icon}
![[DIR]](/icons/dir.gif){kind=icon}
Up to [local] / src / usr.bin / at