term% cat index.txt 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 command to
the current directory is inserted at the beginning, followed by assign‐
ments 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 let‐
ters 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 recog‐
nizably 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)d 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)