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commandlinefu.com is the place to record those command-line gems that you return to again and again. That way others can gain from your CLI wisdom and you from theirs too. All commands can be commented on, discussed and voted up or down.

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check open ports without netstat or lsof

Remove CR LF from a text file
Remove CR LF (CRLF) from a text file. use man:tr to get more info about removing other characters from a file. and even character to character replacements.

C function manual

use SHIFT + ALT to toggle between two keyboard layouts
change the last two-character abbreviation to any layout abbreviation you want. This command will only run in the current session, add to your ~/.bashrc to make this permanent.

Install pip with Proxy
Installs pip packages defining a proxy

View details of network activity, malicious or otherwise within a port range.
View details of both TCP and UDP network activity within a specified port range.

Merge PDFs into single file

determine if tcp port is open
for udp nmap -sU -p 80 hostname

Search for classes in Java JAR files.

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"


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