How to search and replace text where line contains some specific string in Linux shell ?
Today we will look how to search some text in a file and replace specific string on the searched line. For this, we will use sed command i.e. Linux Stream...
Tag: shell
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Regex to look for multiple characters or words in linux bash shell ?
Today we will look at the regex to search/grep multiple characters or words from a file or output in linux. First create a file with below contents. [root@nglinux ]# cat...
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Use of dot “.” in regular expressions during search/grep in bash shell linux ?
Today we will look at the usage of dot “.” on Linux bash shell and how to use it in shell scripts to match a pattern. I. Usage of “.”...
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How to get length of a string/integer variable in linux bash shell ?
Today in this post, we will look how to get length of a variable in linux whether its a string or integer. Getting variable length in Linux 1. Using shell...
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How to unset variables in linux bash shell (normal and read only variables) ?
We all know that a variable is defined by simply assigning a value to it. However bash shell also provides a feature to unset it, in order to free it...
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How to look/grep for special characters in a file in linux bash shell ?
Today in this post, we will look how to search or grep special characters in a file text. To search special characters in linux, we need to escape them using...
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What are the default link count of a new directory or file in linux bash shell ?
One of the interesting interview question or concept for a directory or file on linux bash shell is “what are the default link count of a file/dir when its created.”...
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How to remove empty lines from a file in bash shell linux ?
Today in this post, we will look how to remove empty lines from a file in bash shell linux. This is the easiest way to achieve this task. Removing empty/null...
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How to test a valid IP address in Linux Bash Shell ?
Here is a quick tip to test a valid IP address on linux bash shell. I have recently used it in one of the scripts i need to prepare. I....
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How to pass multiple keystrokes or y to a command in Centos or Redhat Linux ?
In this post, we will check how to automate entering of multiple y’s to a shell command or script. This tip is very useful to sometimes automate few install scripts/commands....