Start a program in background

# echo "/some_dir/myscript.sh" | at now

Add a job to run in 5 days

[root@aixtest333] /root# echo "sleep 50" | at now + 5 days
Job root.1705395399c0.a will be run at Tue Jan 16 09:56:39 CET 2024.

List jobs and status

[root@aixtest333] /root# at -l
root.1705395399c0.a     Tue Jan 16 09:56:39 CET 2024

[root@aixtest333] /root# cat /var/spool/cron/atjobs/root.1705395399c0.a
REAL_USER=rootLOGIN_USER=rootREAL_GROUP=systemGROUPS=system,bin,sys,security,cron,audit,lpAUDIT_CLASSES=RLIMIT_CPU=9223372036854775807RLIMIT_FSIZE=18014398509481984RLIMIT_DATA=18014398509481984RLIMIT_STACK=65536RLIMIT_CORE=2097151RLIMIT_RSS=65536RLIMIT_NOFILE=2000RLIMIT_THREADS=9223372036854775807RLIMIT_NPROC=8192RLIMIT_CPU_HARD=9223372036854775807RLIMIT_FSIZE_HARD=18014398509481984RLIMIT_DATA_HARD=18014398509481984RLIMIT_STACK_HARD=8388608RLIMIT_CORE_HARD=18014398509481984RLIMIT_RSS_HARD=18014398509481984RLIMIT_NOFILE_HARD=9223372036854775807RLIMIT_THREADS_HARD=9223372036854775807RLIMIT_NPROC_HARD=8192UMASK=22PAG_DATA=DOMAINS=
USRENVIRON:_=*11010396*/usr/bin/atAUTHSTATE=compatCLCMD_PASSTHRU=1EDITOR=/usr/bin/viEXTENDED_HISTORY=ONHISTSIZE=10000HISTTIMEFORMAT=%F %T HOME=/rootLANG=en_USLC__FASTMSG=trueLOCPATH=/usr/lib/nls/locLOGIN=rootLOGNAME=rootMAIL=/usr/spool/mail/rootMAILMSG=[YOU HAVE NEW MAIL]NUM_PARALLEL_LPS=12ODMDIR=/etc/objreposPATH=/usr/bin:/etc:/usr/sbin:/usr/ucb:/usr/bin/X11:/sbin:/usr/java8_64/jre/bin:/usr/java8_64/binPS1=[root@aixtest333] $PWD> PWD=/rootSHELL=/usr/bin/ksh93SHLVL=1SSH_CLIENT=1.1.1.1 55567 22SSH_CONNECTION=1.1.1.1 55567 1.1.1.144 22SSH_TTY=/dev/pts/1TERM=xtermTZ=Europe/LuxembourgUSER=rootA__z=! LOGNAME="*SHLVLNLSPATH=/usr/lib/nls/msg/%L/%N:/usr/lib/nls/msg/%L/%N.cat:/usr/lib/nls/msg/%l.%c/%N:/usr/lib/nls/msg/%l.%c/%N.catSYSENVIRON:NAME=rootTTY=/dev/vty0CORE_COMPRESS=onCORE_PATH=/var/coreCORE_NAME=onLOGNAME=root
umask 022
cd /root
sleep 50

Remove a job

[root@aixtest333] /root#  at -r root.1705395399c0.a
The root.1705395399c0.a at file is deleted.
[root@aixtest333] /root# at -l
root.1704964028c0.a     Thu Jan 11 10:07:08 CET 2024