Little Sugar: Creating a device node

To create a device node use mknod

mknod /dev/mem c 1 1

here the device name is /dev/mem

c represents character device this can be block device also

the first 1 represents the major number
the second 1 represents the minor number

Little Sugar: insmod

Linux kernel extensions have a .ko extension are inserted directly into the kernel
using insmod command.

The kernel modules are removed using rmmod.

Kernel modules are generally placed at /lib/modules.

To update kernel dependencies run depmod

ps options

If you invoke the ps command like this

ps -C -o etime,pid,pri,cmd

this will show processes that match the command name and show output using the
fields followed after -o i.e

etime - how long the process is running
pid - the pid of the process
pri - priority of the process
cmd - the full command line of the command

use find magic to create etags

To create a TAGS file so that you can work with emacs / vim use the following command

find . -ipath '*.p*' -print | etags -

the above command for example will create etags for all the pl , pm files in the current directory