perl newbie . &&..programming newbie Post: 302308978

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LEARN ABOUT V7

at

AT(1)							      General Commands 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) at a specified later time.  A cd(1) com-
       mand to the current directory is inserted at the beginning, followed by assignments to all environment variables.  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  invocation	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/spool/at/yy.ddd.hhhh.uu
       activity to be performed at hour hhhh of year day ddd of year yy.  uu is a unique number.
       /usr/spool/at/lasttimedone contains hhhh for last hour of activity.
       /usr/spool/at/past directory of activities now in progress
       /usr/lib/atrun program that executes activities that are due
       pwd(1)

SEE ALSO

       calendar(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.

																	     AT(1)