Commands using date (174)

  • Line can be modified as needed. This considers weekdays to be Mon-Fri. If run any working day it'll provide a parameters for the next working day for "at". "beep" provided as a sample command. This can be modified easily to include wait time. If you need something to run "D" days after today: # D=4;if [ $(date +%u --date="${D} days") -lt 5 ];then AT="+${D} days";else AT="next monday";fi; echo "beep" | at noon ${AT}


    1
    if [ $(date +%u) -lt 6 ];then AT="tomorrow"; else AT="next monday";fi;echo "beep" | at ${AT}
    eduo · 2011-06-01 14:15:11 2

  • -1
    echo $(( $( date +%s ) - $( stat -c %Y * | sort -nr | head -n 1 ) ))
    depesz · 2011-05-12 14:29:45 0
  • Improved version of command #8425. This way, the default browser is used, as opposed to Firefox.


    0
    www-browser http://en.wikipedia.org/wiki/$(date +'%b_%d')
    benjabean1 · 2011-05-09 02:42:32 0

  • 0
    firefox http://en.wikipedia.org/wiki/$(date +'%b_%d')
    dbh · 2011-05-08 03:36:11 0
  • Simple Compressed Backup of the /etc Linux compatible


    -1
    tar jcpf /home/[usuario]/etc-$(hostname)-backup-$(date +%Y%m%d-%H%M%S).tar.bz2 /etc
    mack · 2011-04-29 22:53:11 1
  • If you are stuck behind a firewall and want to synchronize time with another server but you do not want to port forward NTP (which uses UDP) then this command is handy. It gets the time from a server and sets the local time. It is not that accurate but I can live with a second or so drift. Show Sample Output


    1
    date +%Y%m%d%T -s "`ssh user@server 'date "+%Y%m%d %T"'`"
    unixmonkey16473 · 2011-01-11 10:33:32 0
  • even shorter (infix) version. Show Sample Output


    0
    buf() { cp -v $1 ${1/${1%%.*}/$f-$(date +"%Y%m%d_%H%M%S")};}
    unefunge · 2010-12-15 12:16:03 0
  • "infix" version in bash (4.x+) Remove -v to make it silent. BTW: The OP forgot to use "cat" and "nmap" ;-) I had a good laugh though. Show Sample Output


    0
    buf() { f=${1%%.*};e=${1/$f/};cp -v $1 $f-$(date +"%Y%m%d_%H%M%S")$e;}
    unefunge · 2010-12-15 09:50:04 0
  • QR codes are those funny square 2d bar codes that everyone seems to be pointing their smart phones at. Try the following... qrurl http://xkcd.com Then open qr.*.png in your favorite image viewer. Point your the bar code reader on your smart phone at the code, and you'll shortly be reading xkcd on your phone. URLs are not the only thing that can be encoded by QR codes... short texts (to around 2K) can be encoded this way, although this function doesn't do any URL encoding, so unless you want to do that by hand it won't be useful for that.


    7
    qrurl() { curl "http://chart.apis.google.com/chart?chs=150x150&cht=qr&chld=H%7C0&chl=$1" -o qr.$(date +%Y%m%d%H%M%S).png; }
    bartonski · 2010-12-15 04:40:22 0
  • This backup function preserve the file suffix allowing zsh suffix aliases and desktop default actions to work with the backup file too. Show Sample Output


    -3
    buf () {oldname=$1; if [ "$oldname" != "" ]; then datepart=$(date +%Y-%m-%d); firstpart=`echo $oldname | cut -d "." -f 1`; newname=`echo $oldname | sed s/$firstpart/$firstpart.$datepart/`; cp -i ${oldname} ${newname}; fi }
    Seebi · 2010-12-14 19:58:34 1
  • 1. you don't need to prepend the year with 20 - just use Y instead of y 2. you may want to make your function a bit more secure: buf () { cp ${1?filename not specified}{,$(date +%Y%m%d_%H%M%S)}; }


    2
    buf () { cp $1{,$(date +%Y%m%d_%H%M%S)}; }
    unefunge · 2010-12-14 14:02:03 0
  • buf myfile.txt This is useful when you are making small but frequent changes to a file. It keeps things organised and clear for another administrator to see what changed and at what time. An overview of changes can be deduced using a simple: ls -ltr


    1
    buf () { filename=$1; filetime=$(date +%Y%m%d_%H%M%S); cp ${filename} ${filename}_${filetime}; }
    dopeman · 2010-12-14 13:19:52 1
  • cryptic version Show Sample Output


    2
    read -a A <<<"8 9 5 10 6 0 3 11 7 4";B='.*.**..*....***';for C in $(date +"%H%M"|fold -w1);do echo "${B:${A[C]}:4}";done
    unefunge · 2010-11-26 11:29:23 2
  • Lightweight alternative with case Show Sample Output


    0
    for a in $(date +"%H%M"|cut -b1,2,3,4 --output-delimiter=" ");do case "$a" in 0)echo "....";;1)echo "...*";;2)echo "..*.";;3)echo "..**";;4)echo ".*..";;5)echo ".*.*";;6)echo ".**.";;7)echo ".***";;8)echo "*...";;9)echo "*..*";;esac;done
    unefunge · 2010-11-26 10:58:22 0
  • This is useful when watching a log file that does not contain timestamps itself. If the file already has content when starting the command, the first lines will have the "wrong" timestamp when the command was started and not when the lines were originally written.


    6
    tail -f file | while read line; do echo -n $(date -u -Ins); echo -e "\t$line"; done
    hfs · 2010-11-19 10:01:57 4
  • This is freaking sweet!!! Here is the full alias, (I didn't want to cause display problems on commandlinefu.com's homepage): alias tarred='( ( D=`builtin pwd`; F=$(date +$HOME/`sed "s,[/ ],#,g" <<< ${D/${HOME}/}`#-%F.tgz); S=$SECONDS; tar --ignore-failed-read --transform "s,^${D%/*},`date +${D%/*}.%F`,S" -czPf "$"F "$D" && logger -s "Tarred $D to $F in $(($SECONDS-$S)) seconds" ) & )' Creates a .tgz archive of whatever directory it is run from, in the background, detached from current shell so if you logout it will still complete. Also, you can run this as many times as you want, if the archive .tgz already exists, it just moves it to a numbered backup '--backup=numbered'. The coolest part of this is the transformation performed by tar and sed so that the archive file names are automatically created, and when you extract the archive file it is completely safe thanks to the transform command. If you archive lets say /home/tombdigger/new-stuff-to-backup/ it will create the archive /home/#home#tombdigger#new-stuff-to-backup#-2010-11-18.tgz Then when you extract it, like tar -xvzf #home#tombdigger#new-stuff-to-backup#-2010-11-18.tgz instead of overwriting an existing /home/tombdigger/new-stuff-to-backup/ directory, it will extract to /home/tombdigger/new-stuff-to-backup.2010-11-18/ Basically, the tar archive filename is the PWD with all '/' replaced with '#', and the date is appended to the name so that multiple archives are easily managed. This example saves all archives to your $HOME/archive-name.tgz, but I have a $BKDIR variable with my backup location for each shell user, so I just replaced HOME with BKDIR in the alias. So when I ran this in /opt/askapache/SOURCE/lockfile-progs-0.1.11/ the archive was created at /askapache-bk/#opt#askapache#SOURCE#lockfile-progs-0.1.11#-2010-11-18.tgz Upon completion, uses the universal logger tool to output its completion to syslog and stderr (printed to your terminal), just remove that part if you don't want it, or just remove the '-s ' option from logger to keep the logs only in syslog and not on your terminal. Here's how my syslog server recorded this.. 2010-11-18T00:44:13-05:00 gravedigger.askapache.com (127.0.0.5) [user] [notice] (logger:) Tarred /opt/askapache/SOURCE/lockfile-progs-0.1.11 to /askapache-bk/tarred/#opt#SOURCE#lockfile-progs-0.1.11#-2010-11-18.tgz in 4 seconds Caveats Really this is very robust and foolproof, the only issues I ever have with it (I've been using this for years on my web servers) is if you run it in a directory and then a file changes in that directory, you get a warning message and your archive might have a problem for the changed file. This happens when running this in a logs directory, a temp dir, etc.. That's the only issue I've ever had, really nothing more than a heads up. Advanced: This is a simple alias, and very useful as it works on basically every linux box with semi-current tar and GNU coreutils, bash, and sed.. But if you want to customize it or pass parameters (like a dir to backup instead of pwd), check out this function I use.. this is what I created the alias from BTW, replacing my aa_status function with logger, and adding $SECONDS runtime instead of using tar's --totals function tarred () { local GZIP='--fast' PWD=${1:-`pwd`} F=$(date +${BKDIR}/%m-%d-%g-%H%M-`sed -u 's/[\/\ ]/#/g' [[ ! -r "$PWD" ]] && echo "Bad permissions for $PWD" 1>&2 && return 2; ( ( tar --totals --ignore-failed-read --transform "s@^${PWD%/*}@`date +${PWD%/*}.%m-%d-%g`@S" -czPf $F $PWD && aa_status "Completed Tarp of $PWD to $F" ) & ) } #From my .bash_profile http://www.askapache.com/linux-unix/bash_profile-functions-advanced-shell.html Show Sample Output


    8
    alias tarred='( ( D=`builtin pwd`; F=$(date +$HOME/`sed "s,[/ ],#,g" <<< ${D/${HOME}/}`#-%F.tgz); tar --ignore-failed-read --transform "s,^${D%/*},`date +${D%/*}.%F`,S" -czPf "$F" "$D" &>/dev/null ) & )'
    AskApache · 2010-11-18 06:24:34 0

  • 3
    tar cfz backup-$(date --iso).tar.gz somedirs
    jasonjgw · 2010-11-17 23:04:27 0
  • Not as cool as the python example, but it still works. Show Sample Output


    5
    date +"%V"
    SuperFly · 2010-11-17 14:59:31 1
  • Just added view with the eog viewer.


    -1
    wget -O xkcd_$(date +%y-%m-%d).png `lynx --dump http://xkcd.com/|grep png`; eog xkcd_$(date +%y-%m-%d).png
    theanalyst · 2010-10-27 13:42:55 0

  • 0
    TZ="$tz_dest" date -d "$(TZ="$tz_orig" date -d "$tm")"
    warlockcc · 2010-10-01 17:55:04 0

  • -5
    date | md5sum
    yababay · 2010-09-28 20:20:17 0
  • The "date' command has options to easily format the date, day, month, time, etc. But what if you want a relative date or time. Like, I wanted yesterday's date in a particular format. You may want the exact date of "2 months ago" or "-3 days" nicely formatted. For that, you can use this command. The --date option takes fuzzy parameters like the ones mentioned in the previous sentence. Show Sample Output


    2
    date --date=yesterday +%Y%m%d
    vinayv · 2010-09-08 12:29:31 0
  • Create a cronjob that runs weekly to backup your database to a file.


    0
    0 0 * * 0 /usr/bin/mysqldump -uroot -p'<password>' data_base_name > /home/bob/XYZ_DB_BACKUP/$(date +\%Y-\%m-\%d_\%Hh\%M).sql
    dtolj · 2010-09-02 20:07:07 0
  • EXAMPLES jb "next sun 12pm" "/bin/sh ~you/1.sh" & jb "2010-08-29 12:00:00" "~you/1.sh" & jb "29aug2010 gmt" ". ~you/1.sh" & jb 12:00p.m. "nohup ./1.sh" & jb 1min "echo stop!" & SEE ALSO parsedate(3) strftime(3)


    2
    jb() { if [ -z $1 ];then printf 'usage:\njb <"date and/or time"> <"commandline"> &\nsee parsedate(3) strftime(3)\n';else t1=$(date +%s); t2=$(date -d "$1" +%s) ;sleep $(expr $t2 - $t1);$2 ;fi ;}
    argv · 2010-08-26 23:50:42 0
  • 'data' is the directory to backup, 'backup' is directory to store snapshots. Backup files on a regular basis using hard links. Very efficient, quick. Backup data is directly available. Same as explained here : http://blog.interlinked.org/tutorials/rsync_time_machine.html in one line. Using du to check the size of your backups, the first backup counts for all the space, and other backups only files that have changed. Show Sample Output


    1
    rsync -av --link-dest=$(ls -1d /backup/*/ | tail -1) /data/ /backup/$(date +%Y%m%d%H%M)/
    dooblem · 2010-08-05 19:36:24 0
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