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Create tar over SSH
Really useful when out of space in your current machine. You can ran this also with cat for example: $ tar zcvf - /folder/ | ssh root@192.168.0.1 "cat > /dest/folder/file.tar.gz" Or even run other command's: $ tcpdump | ssh root@10.0.0.1 "cat > /tmp/tcpdump.log"

check open ports
Tested in Linux and OSX

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"

Execute a command at a given time
This is an alternative to cron which allows a one-off task to be scheduled for a certain time.

list files recursively by size

Install pip with Proxy
Installs pip packages defining a proxy

Convert numbers to SI notation
converts any number on the 'stdin' to SI notation. My version limits to 3 digits of precious (working with 10% resistors).

To create files with specific permission:

Start dd and show progress every X seconds

find out how many days since given date
You can also do this for seconds, minutes, hours, etc... Can't use dates before the epoch, though.


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