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Here are the Net Install URLs for Centos If you want to use the Net Install Disc for installation : Centos 5.x : Website Name : mirror.centos.org Centos Directory: /centos/5.x/os/i386 Centos 6.x : **URL- 32 Bit : ** http://mirror.centos.org/centos/6.x/os/i386 **URL

In order to implement Disk Quota on Linux Systems, you would need to remount the file system with usrquota and grpquota options. vi /etc/fstab /dev/VolGroup00/LogVol02 /home ext3 defaults,usrquota,grpquota 1 2 mount -o remount /home The next step is to initialize the quota database : quotacheck -cug

If you have hard time remembering the crontab format , you can actually get the format form the info page of crontab. Run this command and you will see the format of the crontab. info crontab | grep –A 6 –i  “allowed values”

You can restart nfs using command “service nfs restart” in linux. The command could create problems sometimes. A better way to restart nfs and related service is : Stopping NFS Services service nfslock stop service nfs stop service portmap stop umount /proc/fs/nfsd **Starting NFS Services ** service portmap start service

Script to check for valid ip !/bin/bash function validateIP() { local ip=$1 local stat=1 if [[ $ip =~ [1] {1,3}.[0-9]{1,3}.[0-9]{1,3}.[0-9]{1,3}$ ]]; then OIFS=$IFS IFS='.' ip=($ip) IFS=$OIFS [[ ${ip[0]} -le 255 && ${ip[1]} -le 255

You can keep track of bash command and output history by using script command. Login to a server and run script /tmp/commandouput.log Now you can continue working. Once you logout and come back into the server, you can view that file to see the command and the output

In order to run interactive command or script which require you to input something , you can use -t option with ssh. eg. ssh -t x.y.z.a 'sh /some/script.sh'

You can use bash script to resize images. Prerequisite : yum install ImageMagick Files with .JPG extension , file will be overwritten with new image !/bin/bash for i in *.JPG; do convert $i -resize 10% $(basename $i .JPG).JPG; done In : $(basename $i .JPG).JPG , the second .JPG is the new

IFS variable comes handy when you want to split a string into array or create a loop. <br></br> #!/bin/bash<br></br> IFS=$','<br></br> dirs='/usr/scripts,/var/lib,/usr/local'<

In order to Mount a windows share to Linux , create a share in your windows \\serverip\shareddrive Now in the linux server create a directory where you want to mount the share mkdir /mnt/winshare Now mount the share by typing the following command: mount -t cifs -o username=<

fsck is a unix file system check utility. It is used to repair , recover and fix disk issues. The following examples display various use cases and options that can be used with fsck. Check a filesystem : fsck /dev/sda1 **Check all filesystems : ** fsck -A ( It is recommended to exclude root

SED: SED is a powerful stream editor. SED Options : -i : does in-place replacement -n : no printing -f : scriptname ( when there are large number of sed commands) Syntax: sed command filename SED Examples Remove n lines from the top of a file : sed -i nd filename where n is the number

For Apache: <Directory /path/to/directory>  php_flag engine off For Nginx : location  /path/to/directory/ { location ~ .*.(php)?$ {   deny all; } }

O : Sort by any top output column M : Sort by Memory usage R : Reverse order K : Kill a task with PID r : Renice a process 1 : Display All CPUs/Cores d : Change refresh rate. : On Demand refresh z or b : HIghlight running processes c : Display Absolute path of command and

netsh firewall set icmpsetting 8

If you are not able to install vmware remote console plugin, then you can manually install the plugin by navigating to the directory and running the installer: %programdir%\VMware\VMware Server\tomcat\webapps\ui\plugin\vmware-vmrc-win32-x86