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Mastering the AWK Command: The Magician of Text Processing
AWK is a powerful scripting language and command-line tool used to search for patterns in text files and to process or reformat data based on those patterns. It's utilized for various text processing tasks such as generating data reports, extracting data, and transforming it. Through this guide, you will learn the basic usage and advanced features of AWK.
cat Command Guide: View and Concatenate File Contents
`cat` command is used to read one or more files and display their content to standard output (usually the terminal screen). It is an abbreviation of 'concatenate', and it also provides the function to concatenate files and output them. Learn various ways to use the `cat` command through this guide.
cmp: Compare two files byte by byte
The `cmp` command compares two files byte by byte, reporting the first differing location and line number. It is useful for quickly checking if simple binary or text files are identical.
column: Format text into columns
The column command reformats text into columns. It's often used to make the output of other commands more readable by presenting it in a tabular format. It supports specifying delimiters and automatically adjusting column widths.
comm: Compare common and unique lines of two sorted files
The comm command compares the contents of two sorted files and outputs lines unique to each file and lines common to both, divided into three columns. It is useful for merging or de-duplication tasks.
cut Command Guide: Extracting Specific Columns from Files
The `cut` command is used to extract specific fields (columns), bytes, or characters from text files or data passed through pipes. It is particularly useful for extracting or processing necessary data from CSV files, log files, etc., and plays a crucial role in building data processing pipelines when used with `awk` or `grep`.
diff: Guide to Comparing Files/Directories
Compares differences between two targets line by line and outputs them in a human-readable format (unified/context/side-by-side). It is widely used for creating patches, code reviews, and comparing configuration changes.
echo Command Guide: Printing Text and Variables
The `echo` command is used to display a string of text to the standard output (usually the terminal screen). It is widely used in shell scripts to show messages to the user, check variable values, append content to files, and more. This guide will help you learn the basic usage and useful options of the `echo` command.
fold: Text Wrapping and Line Limiting
The fold command is used to wrap each line of input text to a specified width. It is useful for making long text files more readable or for processing text in environments with specific width limitations.
Mastering the grep command
This is a guide to the `grep` command, which is used in Linux to search for a specific pattern in text files or standard input. With this tool, you can efficiently find and filter the text you want.
head: Output the beginning of a file
The head command displays the beginning of a text file (by default, the first 10 lines) to standard output. It is useful for quickly understanding the content or format of a file without viewing the entire file.
hexdump: Output Hexadecimal Dump of a File
The hexdump command is a tool that outputs the contents of a file in hexadecimal format. It is useful for analyzing the structure of binary files or for identifying invisible special characters (such as newlines, tabs, etc.) in text files.