# Oneliners

A Growing Collection of Linux Command Line One-Liners

Please believe me... this collection was really supposed to grow over time...

inside a direcotry show disk usage of all hidden files and directories and sort by size:

    $ du $(ls .* -d | tail -n +3) -hs |sort -h

inside a direcotry show disk usage of all files and directories (also hidden) and sort by size.
Exclude 'garbage' file.

    $ du . -a -d 1 -h --exclude=garbage | sort -h

Tar all files in current directory, excluding ./DATA and ./.cache

    $ tar --exclude=.cache -cvf home_miguel_20180216.tar .

Find files in ./ARCHIVE NOT belonging to a specific user: miguel

    $ find ARCHIVE/ \! -user miguel

set folder/ permissions to Read/Browse only for owner recursively

    $ sudo chmod -R u=r,g=,o= folder/
    $ chmod -R u=rX,g=,o= folder/

find all mails from Boban when in the maildir full of mailboxes and print only short headers without bodies:

    $ grepmail -H -B -Y ‘(^TO:|^From:)’ Boban *

not really a one-lier but will print 256 colors in a bash:

    for i in {0..255} ; do
        printf "\x1b[48;5;%sm%3d\e[0m " "$i" "$i"
        if (( i == 15 )) || (( i > 15 )) && (( (i-15) % 6 == 0 )); then
            printf "\n";
        fi
    done

## Web Video and Audio

convert a video to the **WebM** container format, accommodating the **VP8** video codec
and the **MP4** container accommodating the **H.264** codec.

Providing this two versions of your video should result in a decent coverage according to:
<https://developer.mozilla.org/en-US/docs/Web/HTML/Supported_media_formats#Browser_compatibility>

    ffmpeg -i video.mp4 -vcodec vp8 mazeball.webm
    ffmpeg -i video.mp4 -vcodec h264 mazeball.mp4

If you require an audio codec as well use **Vorbis** in **WebM** and 
**AAC** inside **MP4** respectively.

Yet before making a final decision, consider that many modern devices 
have hardware to assist in video and audio decoding, saving on CPU and 
battery consumption.