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monitor memory usage

send a circular

Runs previous command replacing foo by bar every time that foo appears
Very useful for rerunning a long command changing some arguments globally. As opposed to ^foo^bar, which only replaces the first occurrence of foo, this one changes every occurrence.

Display a markdown file in a new tab in firefox

Verify MD5SUMS but only print failures
All valid files are withheld so only failures show up. No output, all checks good.

A command to copy mysql tables from a remote host to current host via ssh.
This version compresses the data for transport.

Install pip with Proxy
Installs pip packages defining a proxy

Ping Twitter to check if you can connect
Returns a JSON object, by connecting to the 'test' endpoint of the Twitter API. Simplest way to check if you can connect to Twitter. Output also available in XML, use '/help/test.xml' for that

Check if x509 certificate file and rsa private key match
A x509 certificate and a rsa key file have in common a parameter called modulus, it is a very long hexadecimal number. That value is unique for each certficate / key pair. The command allows to do the check of this pair of values in a script using a great feature of bash. "

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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