AT(1) General Commands Manual AT(1) at, batch, atq, atrm - , , at [-V] [-q queue] [-f file] [-u username] [-mMlv] timespec ... at [-V] [-q ] [-f ] [-u _] [-mMkv] [-t ] at -c _ [...] at [-V] -l [-o _] [_ ...] atq [-V] [-q ] [-o _] [_ ...] at [-rd] _ [...] atrm [-V] _ [...] batch at -b at batch , /bin/sh. at . atq , (root); . ( ): , , , . atrm , . batch , , 0,8 , atd(8). at , POSIX.2. : . ( , .) midnight (), noon () teatime ( 16:00), AM ( 12:00) PM ( 12:00). , , _ , [], //[], ..[] []--. . now () + _, minutes (), hours (), days () weeks (), at , today, , tomorrow ( ). , 16:00 , at 4pm + 3 days ( at 16:00 + 3 days), 10:00 31 , at 10am Jul 31 ( at 10:00 Jul 31), 01:00 , at 1am tomorrow ( at 01:00 tomorrow). . ( ), ( /etc/crontab 'atd'). : <> (<<; >>). /usr/share/doc/at/timespec. , at, batch , , -f, . , (umask) ( BASH_VERSINFO, DISPLAY, EUID, GROUPS, SHELLOPTS, TERM, UID _). at setuid(2) ( ), (, LD_LIBRARY_PATH LD_PRELOAD) . . . at batch, 'su'(1) ( ), . , . /usr/bin/sendmail. at 'su -' ( ), .. , . (root) . /etc/at.allow /etc/at.deny. . man at.allow(5). -V . -q , a z A Z. at 'a', 'b' batch. 'niceness' (.. ). '=' , . , , , batch. batch (load average). atq , . -m , . -M . -u _ _, . -f , . -t , [[]][.] -l alias atq. -r alias atrm. -d alias atrm. -b alias batch. -v , . "Thu Feb 20 14:50:00 1997". -c ( 'cat') . -o strftime(3), . /var/spool/atd /var/spool/atd /proc/loadavg /var/run/utmp /etc/at.allow /etc/at.deny at.allow(5), at.deny(5), atd(8), cron(1), nice(1), sh(1), umask(2). batch Linux 'proc', /proc. /var/run/utmp , at, , LOGNAME. , . at batch , . , , nqs. 'at' (Thomas Koenig). () algri14 ; GNU (GNU General Public License - GPL, 3 ) , - . - , , () () () . 14 2009 . AT(1)