Commands tagged Linux UNIX

Replace "Master" with desired control name (e.g. Front, Earphone, PCM, etc.).

The command creates an alias called 'path', so it's useful to add it to your .profile or .bash_profile. The path command then prints the full path of any file, directory, or list of files given. Soft links will be resolved to their true location. This is especially useful if you use scp often to copy files across systems. Now rather then using pwd to get a directory, and then doing a separate cut and paste to get a file's name, you can just type 'path file' and get the full path in one operation.

Just the commands for the lvreduce I keep forgetting.

Ever need to erase the contents of a file and start over from scratch? This easy command allows you to do so. Be warned! This will immediately erase all the contents of your file and start you over from scratch (i.e. your file will be at 0 bytes, like if you touch a file).

Returns any file in the folder which would be rejected by Gmail, if you were to send zipped version.

(Yes, you could just zip it and knock the extension off and put it back on the other side, but for some people this just isn't a solution)

find . -type f -iname '*.flac' # searches from the current folder recursively for .flac audio files

| # the output (a .flac audio files with relative path from ./ ) is piped to

while read FILE; do FILENAME="${FILE%.*}"; flac -cd "$FILE" | lame -b 192 - "${FILENAME}.mp3"; done

# for each line on the list:

# FILE gets the file with .flac extension and relative path

# FILENAME gets FILE without the .flac extension

# run flac for that FILE with output piped to lame conversion to mp3 using 192Kb bitrate

You can do some boolean logic like

A or B then C else D using

or : ||

and : &&

So you can do some :

# false || false && echo true || echo false

false

# true || false && echo true || echo false

true

# false || true && echo true || echo false

true

# true || true && echo true || echo false

true

and so on ...

I use it like :

This command can be used to extract the title defined in HTML pages

This assumes there is only one result. Either tail your search for one result or add | head -n 1 before the closing bracket. You can also use locate instead of find, if you have locate installed and updated

Change open-command and type to suit your needs. One example would be to open the last .jpg file with Eye Of Gnome:

eog $(ls -rt *.jpg | tail -n 1)