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Show your local ipv4 IP
To show ipv6 instead, use [[ -6 ]] instead of [[ -4 ]] $ip -o -6 a s | awk -F'[ /]+' '$2!~/lo/{print $4}' To show only the IP of a specific interface, in case you get more than one result: $ip -o -4 a s eth0 | awk -F'[ /]+' '$2!~/lo/{print $4}' $ip -o -4 a s wlan0 | awk -F'[ /]+' '$2!~/lo/{print $4}'

Synchronise a file from a remote server
You will be prompted for a password unless you have your public keys set-up.

kill some pids without specific pid
pgrep, pkill - look up or signal processes based on name and other attributes

Find the package that installed a command

Print trending topics on Twitter

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"

Split a large file, without wasting disk space
It's common to want to split up large files and the usual method is to use split(1). If you have a 10GiB file, you'll need 10GiB of free space. Then the OS has to read 10GiB and write 10GiB (usually on the same filesystem). This takes AGES. . The command uses a set of loop block devices to create fake chunks, but without making any changes to the file. This means the file splitting is nearly instantaneous. The example creates a 1GiB file, then splits it into 16 x 64MiB chunks (/dev/loop0 .. loop15). . Note: This isn't a drop-in replacement for using split. The results are block devices. tar and zip won't do what you expect when given block devices. . These commands will work: $ hexdump /dev/loop4 . $ gzip -9 < /dev/loop6 > part6.gz . $ cat /dev/loop10 > /media/usb/part10.bin

Show account security settings
Show account security settings

Find usb device
I often use it to find recently added ou removed device, or using find in /dev, or anything similar. Just run the command, plug the device, and wait to see him and only him

Extract tarball from internet without local saving


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