Linux CLI commands I Cannot Remember...

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Random CLI Commands

htop - graphical process monitor
iptraf - graphical IP traffic monitor
meshmap - HSMM mesh map generator
figlet - make ASCII letters
chirpw - radio programming
camgrab - CLI webcam pic grabber
pwgen - password generator
links2 - ncurses web browser
inxi -Fx - System information
weather - cli weather info
another weather - curl wttr.in/AVL
price of $BTC - curl rate.sx/BTC or add a time span curl rate.sx/BTC@30d

CLI Commands with some useful syntax

  • list the fingerprint of key
ssh-keygen -lf ~/.ssh/id_rsa.pub
  • parse fail2ban logs
  1. cat /var/log/fail2ban.log | grep Ban | awk '{print $6,$7,$1,$2}' | uniq
  2. sudo cat fail2ban.log | grep Ban | awk '{print $8}' | sort | uniq -c
  3. sudo cat /var/log/fail2ban.log | grep Ban | awk '{print $8,$7}' | sort | uniq -c
  • useless waste of time and peta-flops
cat /dev/urandom | hd | grep "ca fe"
  • Scrape 1FC data from RadioReference
    • parse RadioReference.com 1FC data from website and save CCs to list
wget -O 1fc.html http://www.radioreference.com/apps/db/?sid=7118 && cat 1fc.html | sed 's/[a-zA-Z<>="\/: #-]/ /g' | grep "[7,8][5,6,7][0-9].[0-9][0-9][0-9][0-9][0-9]c" | awk '{ print $6 }' > 1fc.cc
    • or the new version
wget -O 1fc.html http://www.radioreference.com/apps/db/?sid=7118 && cat 1fc.html | grep '[7,8][0-9][0-9].[0-9]\+c' | sed 's/[><]/ /g' | awk '{print $6}' | sort -un > 1fc.cc && wc -l 1fc.cc >> 1fc.cc && cat 1fc.cc | sed 's/1fc.cc/Control Channels/g' > 1fc.txt && cat 1fc.txt
    • parse the 1fc.html data for ALL freqs in use
cat 1fc.html | grep "[7,8][0-9][0-9].[0-9][0-9][0-9][0-9][0-9]" | sed 's/[a-zA-Z<>="\/: #-]//g' > 1fc.all
  • read the "p" text in a news webpage
cat index.html | grep '<p>' | sed 's/<[^<>]*>//g' | sed 's/[^>]*>//g' | sed 's/<[^<]*//g' | sed 's/MORE//g' | festival --tts
  • working outbound mail CLI
cat /var/log/apache2/error.log | mail -s "Apache Error Logs" mail@domain.tld
  • open udp ports for chromecast iptables -I INPUT -p udp -m udp --dport 32768:61000 -j ACCEPT
  • working RTL-SDR ADS-B webserver $PATH/dump1090 --raw --net --net-http-port 8008 & mono $PATH/VirtualRadar.exe
  • modify file timestamp touch -t YYYYMMDDHHMM filename.ext
  • rename images by their EXIF timestamp exiv2 -r'%Y%m%d_%H%M%S' -F *.JPG and exiv2 -r'%Y%m%d_%H%M%S_COMMENT_STUFF' -F *.JPG
  • EAS decoder multimon-ng -a EAS -t wav $FILE
  • rtl-fm play audio localy broadcast FM rtl_fm -g 50 -f 99.9M -M wfm -s 180k -E deemp | play -r 180k -t raw -e s -b 16 -c 1 -V1 - lowpass 16k
  • lock screen rotation in Ubuntu 18.04 on HP ProBook 6560b gsettings set org.gnome.settings-daemon.plugins.orientation active false
  • imagemagick perspective with tiling convert flag.jpg -virtual-pixel tile -distort Perspective '0,0 30,55 2121,0 917,35 0,1414 55,1111 2121,1414 820,707' flagA.jpg
  • imagemagick add watermark/overlay with opacity convert flagA.jpg -resize 1024x1024 miff:- | composite -dissolve 37% -gravity center overlay.png - overlayflag.png
  • convert .mov to .mp4 with ffmpeg - ffmpeg -i my-video.mov -vcodec h264 -acodec mp2 my-video.mp4


  • Convert vertically shot video (I secretly hate you) to proper 16x9 format with "echo pillarboxing" effect on the sides. Ok, it's not a secret. I hate you for vertical video.
ffmpeg -i input.mp4 -vf 'split[original][copy];[copy]scale=ih*16/9:-1,crop=h=iw*9/16,gblur=sigma=20[blurred];[blurred][original]overlay=(main_w-overlay_w)/2:(main_h-overlay_h)/2' output.mp4

More than commands...

Add swap space in Ubuntu 18.04LTS


Scan and check USB drives



Bypass CGNAT(NAT444) with Wireguard and a VPS


Batch transcode .wma to .mp3


Add Alby support to Azuracast Public Page

docker exec -t $YOUR_AZURACAST_CONTAINER /bin/bash
nano /var/azuracast/www/templates/frontend/public/index.phtml

add the line below in the appropriate place with all the other <meta blah blah> tags 

<meta name="lightning" content="lnurlp:$YOUR_ALBY_NAME@getalby.com" />

Boom!!

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