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faster version of ls *
I know its not much but is very useful in time consuming scripts (cron, rc.d, etc).

Deal with dot files safely

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

reverse order of file
awk reverse order of lines (emulates "tac")

Unzip multiple files with one command
With this command you can easily unzip multiple zip files with just one command. All you need to do is to use single quotes.

Regex to remove HTML-Tags from a file
This regular expression removes all HTML-Tags from the file.

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

Restrict the use of dmesg for current user/session
Linux offers an interesting option to restrict the use of dmesg. It is available via /proc/sys/kernel/dmesg_restrict. You can check the status with: $ cat /proc/sys/kernel/dmesg_restrict Alternatively you can use sysctl: $ sudo sysctl -w kernel.dmesg_restrict=1 To make your change persistent across reboot, edit a fille in /etc/sysctl.d/.

List processes sorted by CPU usage

Hex math with bc
To do hex to binary: echo 'ibase=16; obase=2; 16*16' | bc # prints: 111100100 To do 16*16 from decimal to hex: echo 'ibase=10; obase=16; 16*16' | bc # prints: 100 You get the idea... Alternatively, run bc in interactive mode (see man page)


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