The cut command is a command-line utility for cutting sections from each line of a file. It writes the result to the standard output. It’s worth noting that it does not modify the file, but only works on a copy of the content. Although typically the input to a cut command is a file, we can pipe the output of other commands and use it as input.
It can be used to cut parts of a line by byte position, character and field. Basically the cut command slices a line and extracts the text. It is necessary to specify option with command otherwise it gives error. If more than one file name is provided then data from each file is not precedes by its file name.
The following is a list of variables that awk sets automatically on certain occasions in order to provide information to your program. The variables that are specific to gawk are marked with a pound sign (#). These variables are gawk extensions. In other awk implementations or if gawk is in compatibility mode (see section Command-Line Options ), they are not special.
| VARIABLE NAME | DESCRIPTION |
|---|---|
| FS | input field separator variable |
| OFS | Output Field Separator |
| RS | Input Record Separator variable |
| ORS | Output Record Separator Variable |
| NR | Number of Records |
| NF | Number of Fields in a record |
| FILENAME | Name of the current input file |
| FNR | Number of Records relative to the current input file |
| RLENGTH | length of the substring matched by the match() function |
| RSTART | first position in the string matched by match() function |
FS - input field separator variable
It represents the (input) field separator and its default value is space. You can also change this by using -F command line option.
In this awk tutorial, let us review awk conditional if statements with practical examples.
Normally conditional statement checks the condition, before performing any action. If the condition is true action(s) are performed. Similarly action can be performed if the condition is false.
Conditional statement starts with the keyword called "if". Awk supports three different kind of if statement.
awk If Statement
Single Action: Simple If statement is used to check the conditions, if the condition returns true, it performs its corresponding action(s).
What is YUM?
YUM (Yellowdog Updater Modified) is an open source command-line as well as graphical based package management tool for RPM (RedHat Package Manager) based Linux systems. It allows users and system administrator to easily install, update, remove or search software packages on a systems. It was developed and released by Seth Vidal under GPL (General Public License) as an open source, means anyone can allowed to download and access the code to fix bugs and develop customized packages. YUM uses numerous third party repositories to install packages automatically by resolving their dependencies issues.
Resource Monitor
- resmon.exe is an highly useful tool built-in to Windows to monitor the various resource (CPU, Disk) usage of PC. It’s overshadowed by another similar and commonly known tool, Task Manager
although some of its features are superior to the latter.
suspend/resume a running task in Windows
- Open up Resource Monitor. You can search for it in the Start or call it by its pet name resmon
Since the beginning of 2020, FastAPI has been gaining momentum as one of the potential alternatives to Flask server for RESTful API. If you are an existing FastAPI user, you should be aware that it does not come with built-in internationalization, and that will likely not change soon, because internationalization strategies are application-dependent.
The following tutorial focuses on server-side i18n .
This tutorial will show you how to i18n your FastAPI web application easily using the following Python libraries: