Commands using formail (1)

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Sort dotted quads
Sort a list of IPV4 addresses in numerical order. Great as a filter, or within vim using !}

FInd the 10 biggest files taking up disk space

Mount important virtual system directories under chroot'ed directory
The command is useful when, e.g., booting an existing system with a rescue or installation CD where you need to chroot into the hard-disk and be able to do stuff which accesses kernel info (e.g. when installing Ubuntu desktop with LVM2 you need to mount and chroot the hard disk from a shell window in order to install packages and run initramfs inside chroot). The command assumes that /mnt/xxx is where the chroot'ed environment's root file system on the hard disk is mounted.

Create a new file

Set the hardware date and time based on the system date

Set laptop display brightness
Run as root. Path may vary depending on laptop model and video card (this was tested on an Acer laptop with ATI HD3200 video). $ cat /proc/acpi/video/VGA/LCD/brightness to discover the possible values for your display.

Command to logout all the users in one command
Only to logout all users except root

Lists all listening ports together with the PID of the associated process
The PID will only be printed if you're holding a root equivalent ID.

tcpdump sniff pop3,imap,smtp and http

Find the package that installed a command


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