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 “.”...
Tag: redhat
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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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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 get services listening to a particular port in Linux ?
Today we will look how to get the service name listening to a particular port on Linux. The preferred and widely used command is netstat. With netstat, we can grep...
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How to copy files and keep it in sync using rsync command in Linux ?
In this post, we will look at an interesting tip to keep two directories in sync with each other. It helps us to take backup of a directory and perform...
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Linux: How to redirect command output to a file and also view it on screen side by side ?
Here we will see a trick to save the command output to one or more files alongwith viewing the output on screen. This commandis very ueful for logging and at...
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RHEL or Centos: How to count number of files inside a directory in Linux ?
In this article, we will look different ways or tricks to count number of files inside a directory in linux. I. Get files inside /tmp Using “wc -l” command on...