Commands by Giancarlo

Commands by Giancarlo (3)

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using scanner device from command line

you have to replace "mustek_usb" with the scanner found by `scanimage -l`
This is sample output - yours may be different.
2

scanimage -d mustek_usb --resolution 100 --mode Color > image.pnm

Giancarlo · 2009-05-22 14:00:05 9
reduce mp3 bitrate (and size, of course)

Useful if you have to put some mp3 files into mobile devices (ie mobile phones with no much memory)
This is sample output - yours may be different.
2

lame --mp3input -m m --resample 24 input.mp3

Giancarlo · 2009-05-22 13:58:03 3
extract audio from flv to mp3
This is sample output - yours may be different.
2

ffmpeg -i input.flv -f mp3 -vn -acodec copy ouput.mp3

Giancarlo · 2009-05-22 13:56:49 4

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Connect to TCP port 5000, transfer data and close connexion.

With no '-q 0' switch, nc simply waits, and whatever awaits the data hangs.

find distro name / release version

Generate a random password 30 characters long

cat a bunch of small files with file indication

If you have a bunch of small files that you want to cat to read, you can cat each alone (boring); do a cat *, and you won't see what line is for what file, or do a grep . *. "." will match any string and grep in multifile mode will place a $filename: before each matched line. It works recursively too!!

FInd the 10 biggest files taking up disk space

list unique file extensions recursively for a path, include extension frequency stats

Get the longest match of file extension (Ex. For 'foo.tar.gz', you get '.tar.gz' instead of '.gz')

Set laptop display brightness

Run as root. Path may vary depending on laptop model and video card (this was tested on an Acer laptop with ATI HD3200 video). $ cat /proc/acpi/video/VGA/LCD/brightness to discover the possible values for your display.

list block devices

Shows all block devices in a tree with descruptions of what they are.

list block devices

Shows all block devices in a tree with descruptions of what they are.

List docker volumes by container

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