at jobs: queue IDs and job files

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root@calleva:/var/spool/cron/atjobs# echo "sleep 3000" | at 20:58 warning: commands will be executed using /bin/sh job 161 at Sat Jun 3 20:58:00 2023 root@calleva:/var/spool/cron/atjobs# ls a000a101acba0e root@calleva:/var/spool/cron/atjobs# cat a000a101acba0e #!/bin/sh # atrun uid=0 gid=0 # mail root 0 umask 22 LANGUAGE=en_GB:en; export LANGUAGE PWD=/var/spool/cron/atjobs; export PWD LOGNAME=root; export LOGNAME XDG_SESSION_TYPE=tty; export XDG_SESSION_TYPE MOTD_SHOWN=pam; export MOTD_SHOWN HOME=/root; export HOME LANG=en_GB.UTF-8; export LANG SSH_CONNECTION=192.168.0.12\ 60848\ 192.168.0.113\ 22; export SSH_CONNECTION XDG_SESSION_CLASS=user; export XDG_SESSION_CLASS USER=root; export USER SHLVL=0; export SHLVL XDG_SESSION_ID=1202; export XDG_SESSION_ID XDG_RUNTIME_DIR=/run/user/0; export XDG_RUNTIME_DIR SSH_CLIENT=192.168.0.12\ 60848\ 22; export SSH_CLIENT PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/root/.dotnet/tools:/root/bin:/opt/mssql-tools/bin:/usr/games; export PATH DBUS_SESSION_BUS_ADDRESS=unix:path=/run/user/0/bus; export DBUS_SESSION_BUS_ADDRESS SSH_TTY=/dev/pts/5; export SSH_TTY OLDPWD=/root; export OLDPWD cd /var/spool/cron/atjobs || { echo 'Execution directory inaccessible' >&2 exit 1 } sleep 3000 root@calleva:/var/spool/cron/atjobs# atq 161 Sat Jun 3 20:58:00 2023 a root root@calleva:/var/spool/cron/atjobs#

Is there a way to tell that file a000a101acba0e corresponds to queue item 161?

meuh · Accepted Answer · 2023-06-03 09:59:23Z

Looking through the sources we find

writefile(time_t runtimer, char queue) ... (void)snprintf(ppos, sizeof(atfile) - (ppos - atfile), "%c%5lx%8lx", queue, jobno, (unsigned long) (runtimer / 60));

so a000a101acba0e is from

a for "at"
000a1 for the job number 161 in hex. Check with echo $((16#00a1))
01acba0e for the time to run the job, in minutes since the epoch. Check with echo "obase=16;$(date +%s)/60" | bc.

Richard Barraclough · Accepted Answer · 2023-06-03 11:24:20Z

#!/bin/sh for f in /var/spool/cron/atjobs/*; do fn=$(basename $f) jobHex=$(echo "$fn" | cut -c2-6 | tr "a-z" "A-Z") jobDec=$(echo "ibase=16;$jobHex" | bc) tHex=$(echo "$fn" | cut -c7-14 | tr "a-z" "A-Z") tDec=$(echo "ibase=16;$tHex * 3C" | bc) # 0x3C is 60. tT=$(date --date="@$tDec" +%Y-%m-%dT%H-%M) cmd=$(tail -2 $f | head -1) echo "Job $job at $tT is $cmd" done

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