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Send a signed and encrypted email from the command line
A very simple command to send a signed and encrypted message from the command line using GPG Keys

Compute the average number of KB per file for each dir
Shorter version using --tag

Find usb device in realtime
Using this command you can track a moment when usb device was attached.

Find the package that installed a command

Remove all mail in Postfix mail queue.

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.

check open ports without netstat or lsof

intercept stdout/stderr of another process or disowned process
Useful to recover a output(stdout and stderr) "disown"ed or "nohup"ep process of other instance of ssh. With the others options the stdout / stderr is intercepted, but only the first n chars. This way we can recover ALL text of stdout or stderr

Mount a partition from dd disk image
Assuming we have a disk image, ie. created by $dd if=/dev/sda of=image.dd we can check the image's partition layout with $fdisk -ul image.dd then, we substitute "x" with starting sector of the partition we want to mount. This example assumes that the disk uses 512 B sectors

Get your outgoing IP address


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