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exit if another instance is running
runs only one instance.

Google's Text-To-Speech in command line
Improved google text-to-speech function. Allows to specify language, plays sound in terminal. Automatically removes downloaded file after successfully processing. Usage: $ say LANGUAGE TEXT Examples: $ say en "This is a test." $ say pl "To jest test"

Monitoring wifi connection by watch command (refresh every 3s), displaying iw dump info and iwconfig on wireless interface "wlan0"

aptitude easter eggs
this is a reference to Antoine de St. Exupery's "The Little Prince"

Search and Replace across multiple files
- grep for the word in a files, use recursion (to find files in sub directories), and list only file matches -| xargs passes the results from the grep command to sed -sed -i uses a regular expression (regex) to evaluate the change: s (search) / search word / target word / g (global replace)

Which processes are listening on a specific port (e.g. port 80)
swap out "80" for your port of interest. Can use port number or named ports e.g. "http"

grep for minus (-) sign
Use flag "--" to stop switch parsing

Show account security settings
Show account security settings

"hidden" remote shell
opens a "hidden" remote shell (login will not appear in "last" for example). This is not really hidden, because the login will be shown in auth.log and the process is visible anyways. ssh -T = Disable pseudo-tty allocation. bash -i = interactive shell

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


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