Tag: Reviewed

The chmod command is used to modify permissions of files or directories. These permissions control the actions which can be performed on a file or directory, like reading, writing, and executing. It comes from “coreutils-x.x” package.

The chkconfig is used to update and query the runlevel information for system services. It comes from “chkconfig” package. Using chkconfig we can find any service’s startup configuration is it enabled or disbled during the system boot, which is helpful to set the services during the system boot.

The dir command is used to list/see the directory, and with its multipe switches we can get many details of a directory. It comes from “coreutils” package. If used efficiently this can be a very useful command or utility which can come handy for any linux administrator or linux enthusiast.

This command can give you the list of all the environment variables set under the system. It is used to run a program in a modified environment. Command comes from “coreutils” package.

This command is used to eject removable media attached to the system. It gives various optins to manage removable media eject operation. This command comes from “eject”.

Examples: 1. To echo the string on std op device $ echo “Hi there” 2. To skip printing the trailing new line […]

Examples: 1. To check a file system $ e2fsck /dev/sda1$ e2fsck /dev/mapper/VG00-LV00  2. To check the file system and repair it if […]

Examples: 1. To dump the file system information about a device $ dumpe2fs /dev/sda1 2. To print the blocks which are reserved […]

Examples: 1. To get space usage for all $ du -a 2. To print the aparent size instead of disk usage $ […]

It is a command using which we can do low level logical volume management. It comes from “device-mapper-1.02.53” package. Path: /sbin/dmsetup Examples: 1. […]