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Truncate 0.3 sec from an audio file using sox
Using this command one can cut a piece from the end of an audio file.

Change wallpaper for xfce4 >= 4.6.0
Simply changes the wallpaper of xfce4 from the command line. Not for multiple displays.

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

Save a file you edited in vim without the needed permissions
Calls sudo tee like all the other lines, but also automatically reloads the file. Optionally you can add command Wq :execute ':W' | :q and command WQ :Wq to make quitting easier

Get yesterday's date or a previous time
With this command you can get a previous or future date or time. Where can you use this? How about finding all files modified or created in the last 5 mins? touch -t `echo $(date -d "5 minute ago" "+%G%m%d%H%M.%S")` me && find . -type f -newer me List all directories created since last week? touch -t `echo $(date -d "1 week ago" "+%G%m%d%H%M.%S")` me && find . -type d -cnewer me I'm sure you can think of more ways to use it. Requires coreutils package.

cat stdout of multiple commands
Concatenate the stdout of multiple commands.

convert single digit to double digits
each number in a file name gets expanded to the number of digets provided as arg_1 of the arguments in rjust_file_nums. Put the funciton in the .bashrc file. Be sure to $ source ~/.bashrc so that the function will be accessible from bash.

Sort disk usage from directories
Sort disk usage from directories in the current directory

a find and replace within text-based files
using find's exec option instead of a for loop and using sed's -i option for inplace replacement. no need to do the file swap.

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