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Byobu is a suite of enhancements to tmux, as a command line
tool providing live system status, dynamic window management,
and some convenient keybindings:

  F1                             * Used by X11 *
    Shift-F1                     Display this help
  F2                             Create a new window
    Shift-F2                     Create a horizontal split
    Ctrl-F2                      Create a vertical split
    Ctrl-Shift-F2                Create a new session

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# Instruct the interpreter to create a network request and create an object representing the request state. This can be done using the urllib module.

import urllib.request
import tarfile
thetarfile = "http://file.tar.gz"
ftpstream = urllib.request.urlopen(thetarfile)
thetarfile = tarfile.open(fileobj=ftpstream, mode="r|gz")
thetarfile.extractall()

# The ftpstream object is a file-like that represents the connection to the ftp server. Then the tarfile module can access this stream. Since we do not pass the filename, we have to specify the compression in the mode parameter.

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# rotate
ffmpeg -i input.mp4 -map_metadata 0 -c copy -metadata:s:v rotate="180" output.mp4

# extract subs from mp4
# https://superuser.com/questions/393762/how-to-extract-subtitles-from-mp4-and-mkv-movies
ffmpeg -i video.mp4 subtitle.srt

# convert audio (using vbr)
ffmpeg -i input.mkv -c:a libopus -b:a 256k -vbr 1 -af "channelmap=channel_layout=5.1" output.mkv

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from django.db import connection

def idseq(model_class):
    return '{}_id_seq'.format(model_class._meta.db_table)

def get_next_id(model_class):
    cursor = connection.cursor()
    sequence = idseq(model_class)
    cursor.execute("select nextval('%s')" % sequence)
    row = cursor.fetchone()

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# ENCODING PARAMS (AOMENC):
--cpu-used=4 --end-usage=q --tile-columns=1 --tile-rows=1
--bit-depth=10 --lag-in-frames=28 --threads=2
--enable-dist-wtd-comp=0 --enable-qm=1 --quant-b-adapt=3
--mv-cost-upd-freq=2 --enable-chroma-deltaq=1
--enable-fwd-kf=1

# av1an docker SDR 1080p (pre=6,cq=25,denoise=0,grain=15):
docker run --privileged -v "$(pwd):/videos" --user $(id -u):$(id -g) -it --rm masterofzen/av1an:master --encoder aom -s ./movie-scenes.json -c mkvmerge -m lsmash -k --workers 6 -a " -an " --video-params " --bit-depth=10 --cpu-used=6 --cq-level=25 --end-usage=q --lag-in-frames=48 --enable-fwd-kf=1 --aq-mode=1 --deltaq-mode=1 --enable-chroma-deltaq=1 --quant-b-adapt=1 --enable-qm=1 --min-q=1 --enable-keyframe-filtering=2 --arnr-strength=1 --arnr-maxframes=4 --disable-trellis-quant=0 --disable-kf --threads=64 --sharpness=3 --enable-dnl-denoising=0 --denoise-noise-level=15" -i "movie.1080.mkv" -o "movie-aom-pre6-cq25-sharp3-den0-gr15-kff2.mkv"

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// iterate through
Object.entries(myObject).forEach(([key, value]) => {
    console.log(`${key}: ${value}`)
});

// return a new array
Object.entries(myObject).map(([key, value]) => {
    return {
        key,
        value

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htpasswd -nbBC 10 USER topsecret
# USER:$2y$10$vDtCxgJ4DIZ1itAAq6NDkedmaDFHlPdlpLY.EiEa3QBXHnH0oLatW

# used with traefik
echo $(htpasswd -nb USER topsecret) | sed -e s/\\$/\\$\\$/g
# USER:$$apr1$$rjtvYgpl$$urvcY8G0rd9ZpskQc0u28.

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sudo su postgres

# BACKUP
vacuumdb -U postgres --full --analyze --dbname $DBNAME && pg_dump $DBNAME -Ft -v -U postgres -f /tmp/$DBNAME.tar

# RENAME TARGET DB
psql
alter database $T_DBNAME rename to NEWNAME

# OR DROP TARGET DB

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Source

Shortcuts to improve your bash & zsh productivity

So, you hate using a terminal? That might be, because you use the arrow keys to navigate character by character through a long command just to change a paramater at the other end of the line, right? Here's a list of my most-used bash & zsh shortcuts, that will definitely boost your productivity and will help you to improve your command line experience.

Shortcut	Action
CTRL + A	Move to the beginning of the line

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# run specific method in a file
pytest app_folder/file.py -k "method keyword"

# enable debugger
pytest app_folder/file.py -k "method keyword" --pdb

# check for setup errors (wrong imports, etc)
pytest --setup-only