diff:tldr:553fa

The command "diff --unified ${old_file} ${new_file}" is used to compare two files and display the differences between them in a unified format.

Here's what each part of the command means:

• "diff" is the command-line utility in Unix-like operating systems to compare files line by line.
• "--unified" (or "-u" for short) is an option for the "diff" command, indicating that the output should be in a unified format. This format makes it easier to read and understand the differences between the files.
• "${old_file}" is a placeholder representing the path or name of the old file you want to compare. You need to replace "${old_file}" with the actual file path or name.
• "${new_file}" is a placeholder representing the path or name of the new file you want to compare. You need to replace "${new_file}" with the actual file path or name.

When you execute this command with the actual file names, "diff" will compare the contents of the old file with the contents of the new file and display the differences between them in a unified format. The output will show added lines, removed lines, and modified lines. Each difference is displayed with a set of lines from both files to provide context.