AT(1)                   GENIX Programmer's Manual                   AT(1)



      NAME
           at - execute commands at a later time

      SYNOPSIS
           at time [ day ] [ file ]

      DESCRIPTION
           At squirrels away a copy of the named file (standard input  default)
           to be used as input to sh(1) (or csh(1) if you normally use it) at a
           specified later time.  A cd command  to  the  current  directory  is
           inserted  at  the beginning, followed by assignments to all environ-
           ment variables (excepting the variable TERM,  which  is  useless  in
           this context.) When the script is run, it uses the user and group ID
           of the creator of the copy file.

           The time is 1 to 4 digits, with an optional following `A', `P',  `N'
           or  `M' for AM, PM, noon or midnight.  One and two digit numbers are
           taken to be hours, three and four digits to be  hours  and  minutes.
           If no letters follow the digits, a 24 hour clock time is understood.

           The optional day is either (1)  a  month  name  followed  by  a  day
           number, or (2) a day of the week; if the word `week' follows invoca-
           tion is moved seven days further off.  Names of months and days  may
           be recognizably truncated.  Examples of legitimate commands are

                at 8am jan 24
                at 1530 fr week

           At programs are  executed  by  periodic  execution  of  the  command
           /usr/lib/atrun from cron(8).  The granularity of at depends upon how
           often atrun is executed.

           Standard output or error output is lost unless redirected.

      FILES
           /usr/lib/atrun      executor (run by cron(8)).

           in /usr/spool/at:
                yy.ddd.hhhh.*  activity for year yy, day dd, hour hhhh.
                lasttimedone   last hhhh
                past           activities in progress

      SEE ALSO
           calendar(1), pwd(1), sleep(1), cron(8)

      DIAGNOSTICS
           Complains about various syntax errors and times out of range.

      BUGS
           Due to the granularity of the execution of /usr/lib/atrun, there may
           be  bugs  in  scheduling  things  almost  exactly  24 hours into the
           future.



      Printed 11/16/83                                                        1