How to compare file contents?

To compare file contents in Linux, you can use several commands, each serving a different purpose. Here are the most common methods:

1. diff

The diff command compares two files line by line and shows the differences.

Usage:

diff file1.txt file2.txt

Output Explanation:

• Lines that differ will be shown with symbols indicating changes:
  • < indicates a line from file1.txt.
  • > indicates a line from file2.txt.

2. cmp

The cmp command compares two files byte by byte and is useful for binary files.

Usage:

cmp file1.txt file2.txt

Output Explanation:

• If the files are identical, there will be no output. If they differ, it will show the byte and line number where the first difference occurs.

3. comm

The comm command compares two sorted files line by line and shows common and unique lines.

Usage:

comm file1.txt file2.txt

Output Explanation:

• The output will have three columns:
  • Lines unique to file1.txt
  • Lines unique to file2.txt
  • Lines common to both files

4. vimdiff

If you prefer a visual comparison, vimdiff opens both files in a split view in Vim, highlighting differences.

Usage:

vimdiff file1.txt file2.txt

Example:

To compare two text files named example1.txt and example2.txt, you could use:

diff example1.txt example2.txt

Further Learning:

For more practice with file comparison and manipulation, consider exploring relevant labs on LabEx or reviewing the manual pages for each command using:

man diff
man cmp
man comm
man vimdiff

If you have any specific questions or need further assistance, feel free to ask!