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Linux

Sed Command to Replace String in File

November 3, 2021November 3, 2021 Sreeram Sreenivasan Leave a comment CentOS/RHEL, Linux, Ubuntu
sed command to replace string

Sed is a powerful command to work with string & text in Linux. Here is sed command to replace string in file.

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How to Show Banned IP in Fail2ban

November 2, 2021May 16, 2022 Sreeram Sreenivasan 3 Comments CentOS/RHEL, Linux, Ubuntu
list banned ip in fail2ban

Sometimes you may need to view banned IP addresses in Fail2ban. Here is how to show banned IP in Fail2ban.

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How to Unban IP With Fail2ban

November 2, 2021November 2, 2021 Sreeram Sreenivasan Leave a comment CentOS/RHEL, Linux, Ubuntu
unban ip in fail2ban

Sometimes you may need to unban ip addresses with Fail2ban. Here are the steps to do it.

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How to Know Which Shell I am Using in Linux

November 1, 2021November 1, 2021 Sreeram Sreenivasan Leave a comment CentOS/RHEL, Linux, Ubuntu
which shell

Sometimes you may want to know which shell you are using, which shells are installed on your system and how to change shell. Here is how to do it.

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How to Insert Text At Certain Line in Linux

October 28, 2021October 28, 2021 Sreeram Sreenivasan Leave a comment CentOS/RHEL, Linux, Ubuntu
insert text certain line in linux

Sometimes you may need to insert text at certain line in Linux. Here is how to do it using ed, sed, awk, commands.

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How to Uninstall Ubuntu from Dual Boot

October 19, 2021October 19, 2021 Sreeram Sreenivasan Leave a comment Linux, Ubuntu

Sometimes you may need to remove Ubuntu from dual boot menu. Here is how to uninstall Ubuntu from dual boot.

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How to Find & Kill Zombie Processes in Linux

October 18, 2021October 18, 2021 Sreeram Sreenivasan Leave a comment CentOS/RHEL, Linux, Ubuntu
kill zombie process in linux

Sometimes you may have zombie processes in Linux systems. Here is how to find & kill zombie processes in Linux.

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How to Create Startup Disk for Ubuntu

September 28, 2021September 28, 2021 Sreeram Sreenivasan Leave a comment Linux, Ubuntu
create startup disk in ubuntu

Sometimes you may need to create recovery disk for Ubuntu. Here is how to create startup disk for Ubuntu.

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How to Configure NFS Share in Ubuntu

September 27, 2021September 27, 2021 Sreeram Sreenivasan Leave a comment Linux, Ubuntu
configure nfs share ubuntu

NFS is a distributed file system to access network files in Linux. Here is how to configure NFS Share in Ubuntu.

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How to Add User to Sudoers in Linux

September 22, 2021September 22, 2021 Sreeram Sreenivasan Leave a comment CentOS/RHEL, Linux, Ubuntu
add user to sudoers in linux

Sudo users can run commands as root in Linux. Here is how to add user to sudoers in Linux.

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