backup your files in tar archive + timestamp of backup

The internet is full of advice about how to change the caps lock key into a backspace key (a useful practice that originated with Colemak), but a lot of instructions are complicated or outdated.

After *lots* of searching for something that still worked on Ubuntu 14.04, I finally found that this simple command is sufficient and takes effect immediately.

(Found at: http://www.howtogeek.com/194705/how-to-disable-or-reassign-the-caps-lock-key-on-any-operating-system/ )

Easiest way to get the external IP address.

Allows you to have a list of the domains on the server.

To install on centos 6.2

for Centos auto accept:

yum install fortune* -y

yum install cowsay* -y

Removed the -f command as I dont know how, but it works without it.

Almost the same but one folder higher =).

The dmesg will show the kernel it is booting. No more dependency on files

To check the total number of mounts, maximum number of mounts before performing the fsck and last time when the fsck was performed.

Silent:

Prints dots:

Prints process ids:

You cannot anywait for other users processes.

update the output of rsync after completing a file but don't create newlines, just overwrite the last line, this looks a lot better in scripts where you do want to see a progress-indicator, but not the lengthy logs

this option is available since rsync 3.1.0

Define alias for convenience:

Paste man page:

Paste image:

You must have smartmontools installed for this to work. This also assumes you 512 byte sector sizes, this is pretty standard.

Finds duplicates based on MD5 sum. Compares only files with the same size. Performance improvements on:

The new version takes around 3 seconds where the old version took around 17 minutes. The bottle neck in the old command was the second find. It searches for the files with the specified file size. The new version keeps the file path and size from the beginning.

Mirror a remote directory using some tricks to maximize network speed.

lftp:: coolest file transfer tool ever

-u: username and password (pwd is merely a placeholder if you have ~/.ssh/id_rsa)

-e: execute internal lftp commands

set sftp:connect-program: use some specific command instead of plain ssh

ssh::

-a -x -T: disable useless things

-c arcfour: use the most efficient cipher specification

-o Compression=no: disable compression to save CPU

mirror: copy remote dir subtree to local dir

-v: be verbose (cool progress bar and speed meter, one for each file in parallel)

-c: continue interrupted file transfers if possible

--loop: repeat mirror until no differences found

--use-pget-n=3: transfer each file with 3 independent parallel TCP connections

-P 2: transfer 2 files in parallel (totalling 6 TCP connections)

sftp://remotehost:22: use sftp protocol on port 22 (you can give any other port if appropriate)

You can play with values for --use-pget-n and/or -P to achieve maximum speed depending on the particular network.

If the files are compressible removing "-o Compression=n" can be beneficial.

Better create an alias for the command.