Find is a command line utility used to navigate file structures and locate files in the UNIX filesystem, based on certain criteria or conditions. The primary function of the find command is to navigate the directory tree, starting from a defined specified location. The search… Read More »Find in Linux with examples
Just this morning at work I had to search a file for occurences of a certain keyword (to keep this interesting let’s say I had to search for a password named NUCLEAR_CODES_PASSWORD inside a file). It would be easy to just import that file into… Read More »Grep use cases with examples
The cd command is probably the most used Linux command (there is not a definite answer out there in the wild and wide expanses of the internet). It stands for ‘change directory‘ (of course), and is fundamental and indispensable to everyone who at least knows… Read More »Let us talk about cd (change directory)
Logical operators (AND, OR and NOT) serve multiple purposes in bash. First and foremost, they are used to create complex expressions by combining simpler ones. Depending on the version of test and bash in use the syntax of logical operators might change. Logical operators are… Read More »Bash logical operators
In the last article we talked about the test command. The test command evaluates conditional statements on files, strings, and integers. In order to match against a regular expression, we need to use a new type of compound command. This command serves as a wrapper… Read More »Matching regex in bash
In the last article we talked about the basics of Linux shell scripts. In this one, we’ll mention test, a command-line utility that evaluates and compares conditional expressions. Test is a shell builtin most commonly used with the if statement. Depending on the expression, conditional… Read More »Using test in Linux scripts
We can write complex computations using command line tools by creating shell scripts. Shell scripts are nothing more than simple files containing shell commands grouped together. They are called ‘shell scripts‘ because all the complex computations that would need to be typed out to the… Read More »What are Linux shell scripts?
The shell maintains an active command line history. It is an amazing and helpful feature that keeps the track of all the commands that have been entered. Apart from keeping track of all the commands ever typed in in the terminal, we could also reuse… Read More »Using history in command line
This article on escape characters is a natural continuation of the last, which dealt with the echo method. If you, still can’t fully grasp the notion of the echo I fully encourage you to first read that article, and then come back. Done? Amazing –… Read More »How to escape characters in the command line?
Echo is a shell builtin that prints out its arguments to the standard output. The echo command is most commonly used in shell scripts and batch files in order to output some textual data to the user. Although the description of echo seems pretty straightforward,… Read More »The echo command in Linux