Category Archives: Bash - Page 2

Yum Update excluding packages

Posted by on October 14, 2010 Comments Off

http://www.cyberciti.biz/faq/redhat-centos-linux-yum-update-exclude-packages/

yum –exclude=perl* update

Block IP addresses with iptables

Posted by on August 19, 2010 Comments Off

iptables -A INPUT -s IP-ADDRESS -j DROP

then save

service iptables save

Spawn Rsync Expect Timeout!

Posted by on July 24, 2010 Comments Off

So you’ve written a bash script to do a rsync backup, but the script times out?

Scratching your heading trying to figure out what the issue is?  
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CHROOT local users to their own directory

Posted by on July 21, 2010 Comments Off

Once VSFTPD is installed, edit the

/etc/vsftpd/vsftpd.conf file and add the following line if it does not exist

chroot_local_user=YES  
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PID Off….

Posted by on July 16, 2010 Comments Off

find out the process ID of a process

pidof processname

to kill it?

kill -9 PID

Copy files between servers using SCP

Posted by on July 14, 2010 Comments Off

scp username@hostB:~/myfile.file /localdir

hostB is the remote server we want to copy the file from

Proc Info

Posted by on July 11, 2010 Comments Off

System Info – procinfo
procinfo gathers some system data from the /proc directory and prints it formatted on the screen.

Some of the information displayed is  
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Free up some memory with DROP Cache

Posted by on July 11, 2010 Comments Off

sync; echo 3 > /proc/sys/vm/drop_caches

Writing to this will cause the kernel to drop clean caches, dentries and inodes from memory, causing that memory to become free.
This is a non-destructive operation, and dirty objects are not freeable, the user should run “sync” first in order to make sure all cached objects are freed

Change the default editor for Crontab

Posted by on July 11, 2010 Comments Off

export EDITOR=nano

Install the virtual viewer a VNC Client

Posted by on July 11, 2010 Comments Off

Install the Virtual Viewer VNC Client
yum install virt-viewer