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List mp3 files with less than 320 kbps bitrate.

Perl oneliner to print access rights in octal format
This prints file access rights in octal - useful when "stat" is unavailable.

A DESTRUCTIVE command to render a drive unbootable
Overwrites the boot sector. Since this doesn't overwrite any data, you can usually recover by re-creating the partition table exactly the same as before you zeroed it. This can also help sometimes if you install a new drive in a Windows machine which can't read it.

Replace Caps-lock with Control-key
You can return to defaults with "setxkbmap". More here: http://dailycli.blogspot.com/2009/12/xmodmap-replace-caps-lock-with-left.html

View Processeses like a fu, fu
Shows a less detailed output, made only of the process tree and their pids.

Shows space used by each directory of the root filesystem excluding mountpoints/external filesystems (and sort the output)

Duplicate installed packages from one machine to the other (RPM-based systems)

Display all shell functions set in the current shell environment
Uses the shell builtin `declare` with the '-f' flag to output only functions to grep out only the function names. You can use it as an alias or function like so: alias shfunctions="builtin declare -f | command grep --color=never -E '^[a-zA-Z_]+\ \(\)'" shfunctions () { builtin declare -f | command grep --color=never -E '^[a-zA-Z_]+\ \(\)'; }

Find Duplicate Files (based on size first, then MD5 hash)
This dup finder saves time by comparing size first, then md5sum, it doesn't delete anything, just lists them.

Advanced python tracing
Trace python statement execution and syscalls invoked during that simultaneously


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