How a linux command uses C system call defined in header files?
In this post, we will check how a linux command executes on the system. We will learn how a linux command is manipulated by the bash and how it uses...
Month: March 2018
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Viewing POSIX system variables in Linux & how to edit them ?
Every Linux based Operating system has some standard system variables defined in system files. System files here indicate the program header files and functions exists on our linux system and...
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How to run any linux command inside AWK command ?
Today we will look at an interesting tip how to run a linux command inside the awk command. For this trick, we will assign the command to a variable, say...
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How to trace a command or particular system call in the command on Linux ?
In this post, we will check how to trace a command in Linux or a specific system call used by that command. 1. Tracing a command say “ls -l /etc/hosts”...
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How to filter lowercase or uppercase words/letters from a file in Linux ?
Today we will look how to filter lowercase or uppercase letters/words from a file or string in Linux. The easiest way to achieve this task is to use tr command...
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How to list all commands of a package in Linux OR use of info command ?
Today we will look at a very interesting command “info” to view the commands offered by any package on Linux. On redhat based systems, we can also use the rpm...
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How to find process id of current and sub shell in Linux ?
In this post we will look how to find process id of current process and any sub shell process id generated as a result of pipe “|” or function “()”....
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How to create a new folder & cd into the created folder in a single command ?
In this post we will show you a quick tip how can we create a new folder and jump into it. We can use this trick in shell script to...
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How to add line number in the command output or to a file in Linux ?
Suppose you want to add line numbers to the output of some command or when reading any file. In this post we will look at a quick tip how to...
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How to see different PROCESS STATE CODES available in our Linux system ?
In this post, we will see how to list different process state codes which are available on our Linux system. To see the the process state code, you can see...