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Jayakrishnan L
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Bash interpreting a Command
By default bash is the default shell in Linux. Lets see how bash shell interprets the command we type in. It not as simple as checking the binaries in directories specified in the $PATH variable. It flows through the following steps: Redirection Aliases Exp...
Bash interpreting a Command
Bash interpreting a Command
foralllinux.blogspot.com
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Disk Metadata : Superblock, Directory and Inodes
Metadata Filesystem blocks are user for 2 purposes : To store User data and Metadata User data - stores actual data contained in files Metadata - stores file system structural information such as superblock, inodes, directories Metadata describes the struct...
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Recover deleted files used by any process in Linux from RAM memory.
Every thing in Linux is a File. A file in turn is actually a pointer to inode which contain the actual data on the disk, permissions, ownership. Now what happens when a file is deleted ? Only the link is removed by not the inode or the actual data. if a pro...
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Sendmail Error : NOQUEUE: SYSERR(root): No local mailer defined NOQUEUE: SYSERR(root): QueueDirectory (Q) option must be set
Error using m4 macro while building sendmail.cf from sendmail.mc on RHEL 6 / CentOS 6 flavors? [root@cent1]# m4 /etc/mail/sendmail.mc > /etc/mail/sendmail.cf m4:/etc/mail/sendmail.mc:10: cannot open `/usr/share/sendmail-cf/m4/cf.m4': No such file or directo...
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Change Default MTA in RHEL 6 / Cent OS 6
By default Postfix is set as the default mail transfer agent in Redhat Enterprise Linux 6 and Cent OS 6 flavors. However you can change the default Mail transfer Agent in RHEL 6 using the below commands. * Install Sendmail if not yet installed. # yum instal...
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How to configure Veritas Volume Manager VxVM 6.0.2
The disks should be discovered by OS before it can be added to Veritas Volume Manager. 1. List the disks detected by VxVM. # vxdisk -o alldgs list Eg : [root@rhel61 ~]# vxdisk -o alldgs list DEVICE       TYPE            DISK         GROUP        STATUS sda ...
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