Databases
StackOverflow2013
Postsdbo
PO
 

Note that there are some explanatory texts on larger screens.

plurals
  1. PO
    primarykey
    data
    text
    <p>This is probably implementation dependent, but on my system I can rename the job like so:</p> <pre><code>$ # Bash $ sudo ls -l /var/spool/cron/atjobs -rwx------ 1 username daemon 3782 Nov 29 11:24 a00078014854e8 $ atq 120 Mon Nov 29 11:44:00 2010 a username $ printf "%x\n" $((16#14854e8 + 60*2)) # 2 hour delay 1485560 $ sudo mv /var/spool/cron/atjobs/a00078014854e8 /var/spool/cron/atjobs/a0007801485560 $ atq 120 Mon Nov 29 13:44:00 2010 a username </code></pre> <p>The last 8 hex digits in the filename is the number of minutes from the Unix Epoch that determines the time to run the job. Increment that by the number of minutes to delay.</p> <p><strong>Edit:</strong></p> <p>Below is a Bash script to automate the steps above. Here are some example runs:</p> <p>Create a job:</p> <pre><code>$ date Mon Nov 29 20:00:00 CST 2010 $ echo true | at now + 1 hour $ atq 140 Mon Nov 29 21:00:00 2010 a username </code></pre> <p>Reschedule the job for one hour later:</p> <pre><code>$ sudo atrs 140 60 Job 140 in Queue "a" rescheduled from Mon Nov 29 21:00:00 CST 2010 to Mon Nov 29 22:00:00 CST 2010 </code></pre> <p>Reschedule it for 15 minutes earlier:</p> <pre><code>$ sudo atrs 140 -15 Job 140 in Queue "a" rescheduled from Mon Nov 29 22:00:00 CST 2010 to Mon Nov 29 21:45:00 CST 2010 </code></pre> <p>Now add a day:</p> <pre><code>$ sudo atrs 140 $((60 * 24)) Job 140 in Queue "a" rescheduled from Mon Nov 29 21:45:00 CST 2010 to Mon Nov 30 21:45:00 CST 2010 </code></pre> <p>You can specify a queue:</p> <pre><code>$ sudo atrs -q b 141 120 </code></pre> <p>Do a dry run:</p> <pre><code>$ sudo atrs -n 140 30 Job 140 in Queue "a" Current job time: Mon Nov 30 21:45:00 2010 Proposed job time: Mon Nov 30 22:15:00 2010 </code></pre> <p>Here's the script:</p> <pre><code>#!/bin/bash # atrs - reschedule at jobs # atrs [-n] [-q queue] job [-|+]minutes # by Dennis Williamson 2010-11-29 # in response to http://stackoverflow.com/questions/4304631/rescheduling-an-at-job # for Bash 3.2 or greater # this script assumes that the last eight characters of the at job filename is # a sequence of hex digits representing the number of minutes starting at # the Unix epoch that is the time that the job is scheduled to be run LC_COLLATE=C export LC_TIME=C shopt -s nullglob mvcmd=/bin/mv datecmd=/bin/date GREP_OPTIONS= grepcmd=/bin/grep atqcmd=/usr/bin/atq atjobs=/var/spool/cron/atjobs declare -r tab=$'\t' declare -r NOEXIT=0 declare -r EXIT=1 # it's not necessary to bitmap the errors, but I just wanted to declare -r ERROPTS=1 declare -r ERROARG=2 declare -r ERRARGS=4 declare -r ERRQUNM=8 declare -r ERRNOJB=16 declare -r ERRMVFL=32 declare -r ERRNOCH=64 declare -r ERRNINT=128 declare -r DRYRUN=255 # not otherwise possible to reach this number queue=a err=0 error () { (( err |= ${2:-0} )) msg+="${3:+$3\n}" if (( $1 == $EXIT )) then printf "$msg" printf "Usage: ${0##*/} [-n] [-q queue] job [-|+]minutes\n" printf " the default queue is a\n" printf " -n = dry run (default if not superuser)\n" exit $err else return fi } # Process options and arguments options=':q:nh' while getopts $options option do case $option in q ) queue=$OPTARG;; n ) execute=1; ret=$DRYRUN;; # do dry run h ) error $EXIT $DRYRUN;; \? ) if (( (err &amp; ERROPTS) != ERROPTS )) then error $NOEXIT $ERROPTS "Unknown option." fi;; * ) error $NOEXIT $ERROARG "Missing option argument.";; esac done shift $(($OPTIND - 1)) if [[ ! $queue =~ ^[a-zA-Z=]$ ]] then error $NOEXIT $ERRQUNM "Invalid queue name." fi if (( $# != 2 )) then error $NOEXIT $ERRARGS "Job number and offset in minutes are required." fi if [[ $1 =~ ^[0-9]+$ ]] then job=$1 else error $NOEXIT $ERRNINT "Job number must be a positive integer." fi if [[ $2 =~ ^[-+]?[0-9]+$ ]] then minutes=$2 else error $NOEXIT $ERRNINT "Minutes must be an integer." fi if (( err != 0 )) then error $EXIT fi # make preparations if (( $EUID == 0 )) then printf -v old "%05x" "$job" prefix="$atjobs/$queue$old" file=($prefix*) if [[ -z $file || ! -e $file ]] then error $EXIT $ERRNOJB "Job not found." fi oldhex="${file#$prefix}" oldminutes=$((16#$oldhex)) newminutes=$((oldminutes + minutes)) printf -v newhex "%08x" "$newminutes" from=$($datecmd -d @"$(($oldminutes * 60))") to=$($datecmd -d @"$((newminutes * 60))") else if (( execute == 0 )) then printf "You must be superuser to reschedule jobs. The job will be listed instead.\n" execute=1 # do dry run ret=$DRYRUN fi fi # perform action if (( execute == 0 )) then if [[ $file != $prefix$newhex ]] then if $mvcmd "$file" "$prefix$newhex" then printf 'Job %s in Queue "%s" rescheduled\n' "$job" "$queue" printf "from %s\n" "$from" printf "to %s\n" "$to" else error $EXIT $ERRMVFL "Reschedule failed." fi else error $EXIT $ERRNOCH "No change, times are the same." fi else jobdate=$($atqcmd -q $queue | $grepcmd "^$job$tab") if [[ -n $jobdate ]] then jobdate=${jobdate#$job$tab} jobdate=${jobdate%% $queue *} newjobdate=$($datecmd +%c -d "$jobdate + $minutes minutes") if [[ $jobdate != $newjobdate ]] then printf 'Job %s in Queue "%s"\n' "$job" "$queue" printf "Current job time: %s\n" "$jobdate" printf "Proposed job time: %s\n" "$newjobdate" else error $EXIT $ERRNOCH "Proposed time would result in no change." fi else error $EXIT $ERRNOJB "Job not found." fi fi exit $ret </code></pre>
    singulars
    1. This table or related slice is empty.
    1. PORescheduling an at job
      singulars
      1. PTQuestion
    1. PTAnswer
    1. USDennis Williamson
    1. USDennis Williamson
    plurals
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. PORescheduling an at job
      singulars
      1. PTQuestion
    1. This table or related slice is empty.
    1. VO
      singulars
      1. PO
      1. This table or related slice is empty.
      1. VTUpMod
    2. VO
      singulars
      1. PO
      1. This table or related slice is empty.
      1. VTAcceptedByOriginator
    3. VO
      singulars
      1. PO
      1. This table or related slice is empty.
      1. VTUpMod
    1. COA bit hackish but it actually works. That really was a lifesaver. You rock!
      singulars
      1. PO
      1. USMichael Ulm
    2. CO@Michael: Yeah, I suppose it is, although storing the schedule in the filename in the first place is where it originates. I've edited my answer and added a script that automates the steps I outlined in my original answer.
      singulars
      1. PO
      1. USDennis Williamson
 

Querying!

 
Guidance
A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

SQuiL has stopped working due to an internal error.

If you are curious you may find further information in the browser console, which is accessible through the devtools (F12).

Reload