"# Disk to disk backup using dd command: dd is a powerful UNIX
utility, which is used by the Linux kernel makefiles to make boot
images. It can also be used to copy data. This article explains how
to backup entire hard disk and create an image of a hard disk using
# 15 rsync command examples: Every sysadmin should master the
usage of rsync. rsync utility is used to synchronize the files and
directories from one location to another. First time, rsync
replicates the whole content between the source and destination
directories. Next time, rsync transfers only the changed blocks or
bytes to the destination location, which makes the transfer really
"# Three sysadmin rules: If you are a sysadmin, you can't (and
shouldn't) break these three sysadmin rules.
"# User and group disk quota: This article explains how to setup
user and group quote with soft limit, hard limit and grace period.
For example, if you specify 2GB as hard limit, user will not be
able to create new files after 2GB.
"# Troubleshoot using dmesg: Using dmesg you can view boot up
messages that displays information about the hardware devices that
the kernel detects during boot process. This can be helpful during
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