Here are some useful Linux CLI commands, I will do more good examples in the future. For Germans: #maleben

Remove duplicated empty lines:
cat -s file.txt
Find Windows OEM license key in BIOS:
strings /sys/firmware/acpi/tables/MSDM | grep ".*-.*-.*-.*-.*"
Copy file between two hosts directly:
scp -3 host1:/src.file host2:/dst.file
Prepend all lines with timestamp:
ls -la | ts '[%Y-%m-%d %H:%M:%S]'
Resize QEMU disk image:
qemu-img resize image.qcow2 +10G
Rescan disk size without restart:
echo 1 > /sys/block/sda/device/rescan
Reload udev rules without reboot:
udevadm control --reload-rules && udevadm trigger
Reset an USB device via software:
usb_modeswitch -v 3911 -p 7000 -R
Rotate an PDF clockwise:
pdftk input.pdf cat 1-endeast output output.pdf
Replace something in a file:
sed -i 's/ONE/TWO/g' file.txt
Show SW/HW information:
neofetch
Show a ‘show’ like in hacker movies:
hollywood
List block devices, but no loop type:
lsblk -e 7
Convert filesystem to xfs without dump/restore:
fstransform /dev/sda2 xfs
Show amount of dirty disk memory:
grep Dirty /proc/meminfo
Last updated on 2023:01:14 at 00:49 UTC