HowTo – Batch Image Resize on Linux

Suppose you want resize every your photos to put it on web. As you know, you can’t upload your photos on a web page with the highest resolution because a web gallery became inaccessible and too slow to load. Suppose that you have a folder containing every photos of you holidays and you want resize it at 640 of width maintaining original aspect ratio. To make a resize there are many tools but I suggest a command line tool called “mogrify”. This tool will be installed with ImageMagick Libraries, so you have to install ImageMagick on you Linux.

sudo apt-get install imagemagick

Now you can go to your home folder which you have saved your photos and do :

mogrify -resize 640×480! *.jpg

Thank

Top command Description

Description of few parameters of top command:

wa = Waiting for I/O
us = User space
sy = system/kernel
ni = Nice Process
id = Idle
hi = Hardware Interrupts
si = Software Interrupts

EDIT:

1. us -> User CPU time: The time the CPU has spent running users’ processes that are not niced.
2. sy -> System CPU time: The time the CPU has spent running the kernel and its processes.
3. ni -> Nice CPU time: The time the CPU has spent running users’ proccess that have been niced.
4. wa -> iowait: Amount of time the CPU has been waiting for I/O to complete.
5. hi -> Hardware IRQ: The amount of time the CPU has been servicing hardware interrupts.
6. si -> Software Interrupts.: The amount of time the CPU has been servicing software interrupts.

Find Duplicate IP address

Log in as root and type the following

# arping -D -I eth0 -c 2 10.5.70.2

ARPING 10.5.70.2 from 0.0.0.0 eth0

Unicast reply from 10.5.70.2 [00:02:55:C7:1D:49] for 10.5.70.2 [00:02:55:C7:1D:49] 4.222ms

Sent 1 probes (1 broadcast(s))

Received 1 response(s)

[root@govath-pc ~]# echo $?

1

Facebook Chat Now Available with XMPP Pidgin

Configure Pidgin . Do Ctrl+A to open the ‘Accounts’ window, then ‘Add’. On the ‘Basic’ tab, select the XMPP Protocol.
Username: Your Facebook username
Domain: chat.facebook.com
Resource: Pidgin
Password: your Facebook password
Local alias: Alias

On the Advanced tab, then enter the following:
Connect port: 5222
Connect server: chat.facebook.com
Uncheck ‘Require SSL/TLS’

You’re now set to use XMPP ‘Jabber’ with Pidgin

Linux Setfacl Getfacl ACL examples

Some Basic examples of setting permissions to Files.

Granting an additional user read access

$ setfacl -m u:lisa:r file

Revoking write access from all groups and all named users (using the effective rights mask)

$ setfacl -m m::rx file

Removing a named group entry from a file’s ACL

$ setfacl -x g:staff file

Copying the ACL of one file to another

Methond 1:

$ getfacl file1 | setfacl --set-file=- file2

Method 2:

$ getfacl file1 > acls.txt
$ setfacl -f acls.txt file2

Copying the access ACL into the Default ACL

getfacl --access dir | setfacl -d -M- dir