Simplicity of Linux

[Rotten Johnny]

Mount an EXT3/4 drive read only, ensuring that filesystem journal is unaltered i.e. the read only mount is really a read-only mount, not just preventing user writes.
 

Code: [Select]

mount -t ext4 -o ro,noload /dev/blockdev /mnt/fiddle

[rorz0r]

Not to get onto the "Linux vs windows" thing but windows 10 now has a "windows subsystem for Linux" where they've basically mapped most of the Linux kernel operations to the windows kernel and done a bit of interop. You can basically just search the windows store for Linux and install whatever flavour you like. Basically it's a really easy way for a windows user to run most of the tools mentioned in this thread. A lot more convenient than dual booting and a lot more lightweight than VMs.

Sent from my SM-G950F using Tapatalk

[Rotten Johnny]

List all directories that contain a sub-directory

Code: [Select]

find ${base:-.} -type d | sed 's%/[^/]*$%%' | sort -u

[Rotten Johnny]

Embedding album art in FLAC media

My DAP doesn't display album art unless it's embedded in the media...

If you've got your albums stored in discrete folders and each folder contains folder.jpg, embed it in the individual FLAC files is as follows:

Code: [Select]

find . -name "*.flac" -type f -execdir metaflac --import-picture-from="folder.jpg" --show-tag="Title" {} \;
Similarly, removing said file:

Code: [Select]

find . -name "*.flac" -type f -execdir metaflac --remove --block-type=PICTURE {} \;

[Rotten Johnny]

Get a list of the sub-directories that contain one or more files whose name matches a particular pattern

Code: [Select]

find . -type f -name '*.flac' -printf '%h\0' | sort -zu | sed -z 's/$/\n/'
Replace *.flac with your poison.

[Rotten Johnny]

Get a list of the sub-directories that contain one or more files whose name matches a particular pattern and include the number of matching files:

Code: [Select]

#!/bin/bash
find . -type d | while read foldername; do
filecount=$(find "${foldername}" -type f -name '*.flac' | wc -l)
if test $filecount -gt 0
then
echo "${filecount} ${foldername}"
fi
done

[Rotten Johnny]

Pull the md5sum of all FLAC files in a folder tree and append same to a text file

Code: [Select]

find -type f -name \*.flac -print0 | xargs -0 -n1 metaflac --with-filename --show-md5sum >> md5sums.txt

It'll generate a text file that looks something like this which is then easily pulled into a table to enable duplicate tracks to be found across your files:

Code: [Select]

./flaclib/B/Beth Orton - Kidsticks/01-Snow.flac:db08387254688d6c8b8043e5fd916fc4
./flaclib/B/Beth Orton - Kidsticks/02-Moon.flac:cc53b82c47e5d9463a09049defa7f241
./flaclib/B/Beth Orton - Kidsticks/03-Petals.flac:44be22679525000b335492a3f9244283
./flaclib/B/Beth Orton - Kidsticks/04-1973.flac:bfb97b9dc3d9c401b7e6772825afd044
./flaclib/B/Beth Orton - Kidsticks/05-Wave.flac:140428be1417050ca2959bb6a6d5c2ad
./flaclib/B/Beth Orton - Kidsticks/06-Dawnstar.flac:49d08bba73ae526874f022c163ea292b
./flaclib/B/Beth Orton - Kidsticks/07-Falling.flac:2119c0470d3bc77dc7a732b2f1e3653b
./flaclib/B/Beth Orton - Kidsticks/08-Corduroy Legs.flac:e57c2a83bf9914b07ce2a63e8d478a32
./flaclib/B/Beth Orton - Kidsticks/10-Kidsticks.flac:3b2f96afc30ee53cfeb5b781a79fdc15
./flaclib/B/Beth Orton - Kidsticks/09-Flesh and Blood.flac:042dc117ff9e00e0fae09b7d30b7283a

[Rotten Johnny]

Replace a newline (\n) using sed

Code: [Select]

sed ':a;N;$!ba;s/\n/INSERT_REPLACEMENT_STRING_HERE/g' source_file > target_file

[Rotten Johnny]

Recursively delete empty sub-directories within current directory tree

Code: [Select]

find . -type d -empty -delete

[Rotten Johnny]

Delete all files having a specific extension where the filename does not begin with the digits 0-9:

Code: [Select]

find . -name "[^0-9]*.flac" -type f -exec rm {} \;

[Rotten Johnny]

Update all github repos

Code: [Select]

find . -type d -name .git -exec sh -c "cd \"{}\"/../ && pwd && git pull" \;

[Rotten Johnny]

Rename and move all files stored in CD1, CD2, CDx subfolders to ../x-filename

Run this from the parent folder you're looking to process:

Code: [Select]

find . -type d -iname "CD?" -exec ~/renameandmove.sh "{}" \;
Contents of renameandmove.sh (save in your home folder and chmod +x renameandmove.sh)

Code: [Select]

#!/bin/bash

# prepends a number to all files in folder and then moves them to parent folder.
#run this from the parent folder you're looking to process: find . -type d -iname "CD?" -exec ~/renameandmove.sh "{}" \;

DIRECTORY=$1
PREFIX=${DIRECTORY: -1}
cd "$DIRECTORY"
for FILE in *; do mv "$FILE" "$PREFIX-$FILE"; done
mv * ..

[Tricky]

Downloading numerous numbered (or lettered) files over http using Curl. Useful for things like lecture slides and easier than writing a shell script, as http doesn't usually support using wildcards for downloading multiple items.

Code below will download "numbered_file1.pdf", "numbered_file2.pdf" and so on into the working directory.

Code: [Select]

curl -O "http://whatever/static/files/numbered_file[1-20].pdf"

[chrisc]

The Devialet Chat forum and also Computer Audio are touting the benefits of Audio Linux.

Must have a look at this

[BWS]

Not just for audio