Annotation of src/usr.bin/at/at.1, Revision 1.4
1.4 ! millert 1: .\" $OpenBSD: at.man,v 1.6 1997/02/22 19:54:05 peter Exp $
! 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: This is the default configuration.
! 169: .Pp
! 170: An empty
! 171: .Pa /var/at/at.deny
! 172: means that every user is allowed use these commands.
! 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
! 224: Cats the jobs listed on the command line to standart 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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