NAME

at − execute commands at a later time

SYNOPSIS

at time [ day ] [ file ]

DESCRIPTION

At stores a copy of the named file (standard input default) to be used as input to sh(1) (or csh(1) if normally used) at a later specified time. A cd command to the current directory is inserted at the beginning, followed by assignments to all environment variables, except 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, respectively.  One and two digit numbers are assumed to be hours; three and four digits to be hours and minutes.  If no letters follow the digits, this is assumed as  24 hour clock time. 

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 as follows:

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

in /usr/spool/at:
yy.ddd.hhhh.\(**activity for year yy, day dd, hour hhhh. 
lasttimedonelast hhhh
pastactivities in progress

SEE ALSO

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

DIAGNOSTICS

Indicates 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 events almost exactly 24 hours into the future. 

4th Berkeley Distribution  —  @(#)at.1 1.1 %Q% %Y%