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--- at [2012/03/23 19:45]
k2patel created
+++ at [2020/08/10 02:35]
@@ Line 1: / Line 1: @@
-====== at (linux) ======
-In Unix-like computer operating systems, the at command is used to schedule commands to be executed once, at a particular time in the future.
-More precisely, it reads a series of commands from standard input and collects them into one "at-job" which is carried out at a later date. The at-job inherits the current environment, so that it is executed in the same working directory and with the same environment variables set as when it was scheduled.
-It differs from cron which is used for recurring executions (e.g. once an hour, every Tuesday, January 1 every year). As with cron, many Unix systems allow the administrator to restrict access to the at command.
-at can be made to mail a user when done carrying out a scheduled job of theirs, can use more than one job queue, and can read a list of jobs to carry out from a file instead of standard input. A sample command to compile a C program at 11:45 a. m. on January 31st and e-mail the results (STDOUT and STDERR) to your user ID would be:
-<code bash>
- $ echo "cc -o foo foo.c" | at 1145
- $ at 1145 jan 31
- at> cc -o foo foo.c
- at> ^D (press Control-D while at the beginning of a line)
- $ atq
-2011-08-12 11:45 cc -o foo foo.c user
- $ atrm 1234
- $ atq
- $
-</code>
-In some Unix-like computer operating systems it uses a daemon, atd, which waits in the background periodically checking the list of jobs to do and executing those at their scheduled time on behalf of at.

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