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My name is Anurag
Computer engineer

Redhat RHCSA certified

This is my personal blog.

Having good skills in troubleshooting of Software, Hardware & Networking, Web development & Databases...

Here you find my academic computer engg books
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sed

Sed Command in Linux/Unix with examples SED command in UNIX is stands for stream editor and it can perform lot’s of function on file like, searching, find and replace, insertion or deletion. Though most common use of SED command in UNIX is for substitution or for find and replace. By using SED you can edit files even without opening it, which is much quicker way to find and replace something in file, than first opening that file in VI Editor and then changing it. o     SED is a powerful text stream editor. Can do insertion, deletion, search and replace(substitution). o     SED command in unix supports regular expression which allows it perform complex pattern matching. Syntax: sed OPTIONS... [SCRIPT] [INPUTFILE...] Example: Consider the below text file as an input. $cat > geekfile.txt unix is great os. unix is opensource. unix is free os. learn operating system. unixlinux which one you choose. unix is easy to learn.unix ...
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initramfs" file is deleted or corrupted on your RHEL or CentOS 7

Initrd/Initramfs image provides the capability to load a RAM disk by the boot loader. This RAM disk can then be mounted as the root filesystem and programs can be run from it. Afterwards, a new root file system can be mounted from a different device. The previous root filesystem which was mounted from initrd/initramfs is then moved to a directory and can be subsequently unmounted. Their are chances that either you might have accidentally deleted "initramfs" file from the /boot partition or it is corrupted due to some reason.  Then boot process will get interrupted and you will see below error: error: file '/initramfs-3.10.0-957.el7.x86_64.img' not found. Good news is you can still recover this "initramfs" by following below steps: Step 1 :  Mount RHEL or CentOS 7 ISO image on your physical server and boot from it. In case you are using HPE Prolient server you can mount this ISO image on iLO, if this is virtual environment then mount it accordingly and reboot...
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nw commands

troubleshoot commands in Linux.   1. ifconfig ifconfig (interface configurator) command   is use to initialize an interface, assign IP  Address to interface and enable or disable  interface on demand. With this command  you can view IP Address and Hardware / MAC   address assign to interface and also MTU (Maximum transmission unit) size. # ifconfig   eth0       Link encap:EthernetHWaddr 00:0C:29:28:FD:4C inet addr:192.168.50.2   Bcast:192.168.50.255   Mask:255.255.255.0           inet6 addr: fe80::20c:29ff:fe28:fd4c/64 Scope:Link           UP BROADCAST RUNNING MULTICAST   MTU:1500   Metric:1           RX packets:6093 errors:0 dropped:0 overruns:0 frame:0  ...
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