Commands by pascalv (7)

  • Apart from an exact copy of your recent contents, also keep all earlier versions of files and folders that were modified or deleted. Inspired by the excellent EVACopy Show Sample Output

    backup() { source=$1 ; rsync --relative --force --ignore-errors --no-perms --chmod=ugo=rwX --delete --backup --backup-dir=$(date +%Y%m%d-%H%M%S)_Backup --whole-file -a -v $source/ ~/Backup ; } ; backup /source_folder_to_backup
    pascalv · 2018-08-02 21:27:29 0
  • This takes a picture (with the web cam) every 5 minutes, and send the picture to your e-mail. Some systems support mail -a "References: " so that all video surveillance emails are grouped in a single email thread. To keep your inbox clean, it is still possible to filter and move to trash video surveillance emails (and restore these emails only if you really get robbed!) For instance with Gmail, emails sent to can be filtered with "Matches:" Show Sample Output

    while true ; do fswebcam -d /dev/video0 -r 1280x1024 -F 15 - | uuencode $(date +\%Y\%m\%d\%H\%M).jpeg | mail -s "Video surveillance" ; sleep 300 ; done
    pascalv · 2016-08-09 14:22:45 0
  • Access a random news web page on the internet. The Links browser can of course be replaced by Firefox or any modern graphical web browser.

    links $( a=( $( lynx -dump -listonly "" | grep -Eo "(http|https)://[a-zA-Z0-9./?=_-]*" | grep -v "" | sort | uniq ) ) ; amax=${#a[@]} ; n=$(( `date '+%s'` % $amax )) ; echo ${a[n]} )
    pascalv · 2016-07-26 11:52:12 3
  • (In French) Connection aux hotspots FreeWifi, et maintien de la connection active

    while true ; do wget --quiet --no-check-certificate --post-data 'login=my_account_number&password=my_password&submit=Valider' '' -O '/dev/null' ; sleep 600; done
    pascalv · 2016-07-23 16:34:42 1
  • Sweep and download all mp3 (in French) of "Rendez-vous avec X" (Meet with M. X) of French public radio From 1997 To 2015 Balaye et telecharge les episodes depuis 1997 jusqu'en 2015

    pascalv · 2015-08-13 21:34:50 2
  • Run "ps -x" (process status) in the background every hour (in this example). The outputs of both "nohup" and "ps -x" are sent to the e-mail (instead of nohup.out and stdout and stderr). If you like it, replace "ps -x" by the command of your choice, replace 3600 (1 hour) by the period of your choice. You can run the command in the loop any time by killing the sleep process. For example ps -x 2925 ? S 0:00.00 sh -c unzip >/dev/null 2>&1 11288 ? O 0:00.00 unzip 25428 ? I 0:00.00 sleep 3600 14346 pts/42- I 0:00.01 bash -c while true; do ps -x | mail pascalv; sleep 3600; done 643 pts/66 Ss 0:00.03 -bash 14124 pts/66 O+ 0:00.00 ps -x kill 25428 You have mail in /mail/pascalv Show Sample Output

    nohup bash -c "while true; do ps -x | mail; sleep 3600; done" | mail &
    pascalv · 2013-08-19 17:21:37 5
  • This will send the web page at $u to . To send the web page to oneself, can be replaced by $(whoami) . The "charset" is UTF-8 here, but any alternative charset of your choice would work. `wget -O - -o /dev/null $u` may be considered instead of `curl $u` . On some systems the complete path to sendmail may be necessary, for instance /sys/pkg/libexec/sendmail/sendmail for some NetBSD.

    { u=""; echo "Subject: $u"; echo "Mime-Version: 1.0"; echo -e "Content-Type: text/html; charset=utf-8\n\n"; curl $u ; } | sendmail
    pascalv · 2010-02-24 04:18:30 1

What's this? is the place to record those command-line gems that you return to again and again. That way others can gain from your CLI wisdom and you from theirs too. All commands can be commented on, discussed and voted up or down.

Share Your Commands

Check These Out

Use tcpdump to monitor all DNS queries and responses

Get info on RAM Slots and Max RAM.

Create a simple video contact sheet using the vcs bash script
Assumes you've downloaded Toni Corvera's vcs script (, have it in your PATH, and have installed the script's dependencies. Generates a video contact sheet of 24 thumbnails and 3 thumbnails per column. The bold font and white-on-black color scheme keeps the text readable at the chosen 70% JPEG compression quality, which keeps the file size at a manageable level. You can go even lower with the quality and get a good looking result.

Show crontabs for all users
added echo "### Crontabs for $user ####"; to make clear whose crontab is listed.

Numerically sorted human readable disk usage
Provides numerically sorted human readable du output. I so wish there was just a du flag for this.

tar pipe to copy files, alternate to cp -Ra
uses tar to dump files from /orignl/path to /dst/dir. i find tar's out more readable than cp, and it doesn't mess with modified dates.

Find the package that installed a command

Find usb device in realtime
Using this command you can track a moment when usb device was attached.

find and delete empty dirs, start in current working dir

Generate soothing noise
Substitute 'brown' with 'pink' or 'white' according to your taste. I put this on my headphones when I'm working in an "open concept" office, where there are always three to five conversations going in earshot, or if I'm working somewhere it is "rude" of me to tell a person to turn off their cubicle radio.

Stay in the loop…

Follow the Tweets.

Every new command is wrapped in a tweet and posted to Twitter. Following the stream is a great way of staying abreast of the latest commands. For the more discerning, there are Twitter accounts for commands that get a minimum of 3 and 10 votes - that way only the great commands get tweeted.


Subscribe to the feeds.

Use your favourite RSS aggregator to stay in touch with the latest commands. There are feeds mirroring the 3 Twitter streams as well as for virtually every other subset (users, tags, functions,…):

Subscribe to the feed for: