Commands using sort (800)

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Convert multiple flac files to mp3
make sure that flac and lame are installed sudo apt-get install lame flac

Rotate a single page PDF by 180 degrees
More pdftk examples: http://www.pdflabs.com/docs/pdftk-cli-examples/

Get max number of arguments
Get max number of arguments that can be accepted by the exec() system call.

Changing the terminal title to the last shell command
You can set the previous bash command as the terminal title by this command. Explanation: -trap assigns a command to execute at a given bash signal. -in the $BASH_COMMAND you find the last command -you can set the terminal title with the escape sequence: \e]0;this is the title\007 -to let the echo care about the backslashes give the -e to it Since trap is a built in bash command you find more informatin in 'man bash'for more Source: http://www.davidpashley.com/articles/xterm-titles-with-bash.html

Echo the contents of a Url
Directly send the content of a url to standard out. This command is most convenient for sending the output of a download directly to another command.

Get your external IP address

Given $PID, print all child processes on stdout
Simpler.

nmap port scanning
TCP Connect scanning for localhost and network 192.168.0.0/24

Find the package that installed a command

Btrfs: Find file names with checksum errors
Btrfs reports the inode numbers of files with failed checksums. Use `find` to lookup the file names of those inodes. The files may need to be deleted and replaced with backups.


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