tldr/pages/common/diff.md

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# diff
> Compare files and directories.
> More information: <https://man7.org/linux/man-pages/man1/diff.1.html>.
- Compare files (lists changes to turn `old_file` into `new_file`):
`diff {{old_file}} {{new_file}}`
- Compare files, ignoring white spaces:
`diff -w {{old_file}} {{new_file}}`
- Compare files, showing the differences side by side:
`diff -y {{old_file}} {{new_file}}`
- Compare files, showing the differences in unified format (as used by `git diff`):
`diff -u {{old_file}} {{new_file}}`
- Compare directories recursively (shows names for differing files/directories as well as changes made to files):
`diff -r {{old_directory}} {{new_directory}}`
- Compare directories, only showing the names of files that differ:
`diff -rq {{old_directory}} {{new_directory}}`