Raccourcis BASH

Control Key combinations (CTRL+KEY)

   Ctrl + a : jump to the start of the line
   Ctrl + b : move back a char
   Ctrl + c : terminate the command
   Ctrl + d : delete from under the cursor
   Ctrl + e : jump to the end of the line
   Ctrl + f : move forward a char
   Ctrl + k : delete to EOL
   Ctrl + l : clear the screen
   Ctrl + r : search the history backwards
   Ctrl + R : search the history backwards with multi-occurrence
   Ctrl + u : delete backward from cursor
   Ctrl + w : delete backward a word
   Ctrl + xx : move between EOL and current cursor position
   Ctrl + z : suspend/stop the command

Alt Key combinations (ALT+KEY)

   Alt + < : move to the first line in the history
   Alt + > : move to the last line in the history
   Alt + ? : show current completion list
   Alt + * : insert all possible completions
   Alt + / : attempt to complete filename
   Alt + . : yank last argument to previous command
   Alt + b : move backward
   Alt + c : capitalize the word
   Alt + d : delete word
   Alt + f : move forward
   Alt + l : make word lowercase
   Alt + n : search the history forwards non-incremental
   Alt + p : search the history backwards non-incremental
   Alt + r : recall command
   Alt + t : move words around
   Alt + u : make word uppercase
   Alt + Backspace : delete backward from cursor

Escape Key combinations (ESC+KEY)

   Esc + d : delete from cursor position to end of the word
   Esc + f : move forward a word
   Esc + b : move backward a word
   Esc + t : transpose two adjacent words

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Thanks to:

http://cheat.errtheblog.com/s/bash
http://www.shell-tips.com

Monter un volume veracrypt en ligne de commande avec cryptsetup ou veracrypt

sudo cryptsetup --veracrypt open --type tcrypt '/media/moi/DT16G/container' veracrypt1
sudo mount /dev/mapper/veracrypt1 /media/veracrypt1/
sudo umount /media/veracrypt1
sudo cryptsetup --veracrypt close --type tcrypt veracrypt1

veracrypt '/media/moi/DT16G/container' /media/veracrypt1/
veracrypt -d veracrypt1

UFW PASSIVE FTP RASPERRY PI doesn't work anymore FIX

# cat /proc/sys/net/netfilter/nf_conntrack_helper
# 0
# echo 1 >  /proc/sys/net/netfilter/nf_conntrack_helper

# cat /proc/sys/net/netfilter/nf_conntrack_helper
#1

Fix the problem. 

Stop Opera browser to ask for unlocking keyring at startup

Use this option --password-store=basic

How to normalize sound using ffmpeg / python script ffmpeg-normalize

How to normalize audio using ffmpeg


from https://github.com/slhck/ffmpeg-normalize (thanks !)

Installation:

pip install ffmpeg-normalize

Usage:

ffmpeg-normalize [options] ...

Options:

• -f, --force — Force overwriting existing files
• -l, --level — dB level to normalize to [default: -26]
• -p, --prefix — Normalized file prefix [default: normalized]
• -t, --threshold — dB threshold below which the audio will be not adjusted [default: 0.5]
• -o, --dir — Create an output folder in stead of prefixing the file
• -m, --max — Normalize to the maximum (peak) volume instead of RMS
• -v, --verbose — Enable verbose output
• -n, --dry-run — Show what would be done, do not convert
• -d, --debug — Show debug output
• -u, --merge — Don’t create a separate WAV file but update the original file. Use in combination with -p to create a copy
• -a, --acodec — Set audio codec for ffmpeg (see “ffmpeg -encoders”) when merging. If not set, default from ffmpeg will be used.
• -e, --extra-options — Set extra options passed to ffmpeg (e.g. “-b:a 192k” to set audio bitrate)

Examples:

ffmpeg-normalize -v file.mp3
ffmpeg-normalize -v *.avi
ffmpeg-normalize -u -v -o -f -m -l -5 *.mp4
ffmpeg-normalize -u -v -a libfdk_aac -e "-b:a 192k" *.mkv 

Exemple perso

ffmpeg-normalize -v -u -o *.mp3

Attention ça réencode avec les paramètres par défaut de ffmpeg.

Pour changer les settings utiliser les options -a -e

Voir aussi http://superuser.com/questions/323119/how-can-i-normalize-audio-using-ffmpeg 

Thanks to http://superuser.com/users/48078/slhck

rotate, pad video to the screen size to post on the instagram story

Pour ajuster des vidéos faites en 640x480 et les ajuster à la taille de l'écran de l'alcaltel pixi 4 5" 848x480 afin de poster sur la story d'instagram tout en maîtrisant le cadre.

for file in *.mp4;do name=`/usr/bin/basename $file .mp4`;ffmpeg -i $file -vcodec libx264 -vf "transpose=1,pad=480:848:0:104" -c:a copy  resized/$name-resized.mp4;done

renaming files numbered - command line

ls | cat -n | while read n f; do mv "$f" "base-$n.extension"; done