cut and paste in Bash Scripting

Introduction

Cut and paste help you extract or combine parts of text quickly in scripts or the command line.

You want to get specific columns from a text file or command output.

You need to join fields from two files side by side.

You want to rearrange or remove parts of lines in a file.

You want to copy some text from one place and add it to another.

You want to process data in scripts by cutting or pasting fields.

Syntax

Bash Scripting

cut [options] [file]
paste [options] [file1 file2 ...]

Use 'cut' to extract sections from each line of a file or input.

Use 'paste' to merge lines of files horizontally, separated by tabs by default.

Examples

Extracts the second field from a CSV file using comma as delimiter.

Bash Scripting

cut -d',' -f2 file.csv

Joins lines from file1.txt and file2.txt side by side separated by tabs.

Bash Scripting

paste file1.txt file2.txt

Cuts the first 5 characters from each line of file.txt.

Bash Scripting

cut -c1-5 file.txt

Joins lines from two files using ':' as the delimiter instead of tab.

Bash Scripting

paste -d ':' file1.txt file2.txt

Sample Program

This script creates two files, extracts the color column from the CSV, then pastes the names and fruit info side by side with ':' separator.

Bash Scripting

# Create two sample files
printf "apple,red,1\nbanana,yellow,2\ncherry,red,3\n" > fruits.csv
printf "John\nJane\nJoe\n" > names.txt

# Extract second field (color) from fruits.csv
cut -d',' -f2 fruits.csv

# Paste names.txt and fruits.csv side by side with ':' delimiter
paste -d ':' names.txt fruits.csv

# Clean up
rm fruits.csv names.txt

Important Notes

If you do not specify a delimiter with cut, it defaults to tab.

Paste joins lines horizontally; if files have different line counts, missing lines appear empty.

Use quotes around delimiters if they are special characters.

Summary

Cut extracts parts of lines by fields or characters.

Paste joins lines from multiple files side by side.

Both are useful for quick text processing in scripts.