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#BEST DIFF TOOL LINUX COMMAND LINE HOW TO#
#BEST DIFF TOOL LINUX COMMAND LINE PATCH#

When using “c”, the line numbers left of it are the lines in the original file that should be replaced with text contained in the patch, and the line numbers right of it are the lines the content should be in in the patched version of the file.

The syntax is (line number or range)(c, a or d)(line number or range), although when using “a” or “d”, one of the (line number or range) parts may only contain a single line number. Two other characters with a meaning exist: “a” and “d”, with “a” meaning “add” or “append” and “d” meaning “delete”.

#BEST DIFF TOOL LINUX COMMAND LINE PATCH#

The “c” tells patch to replace the content of the lines. Note that those line numbers can also be line ranges (12,15 means line 12 to line 15).

You can create these files yourself if you want to run the commands in the tutorial and get about the same output.The 1c1 is a way of indicating line numbers and specifying what should be done. Note: to demonstrate the creation of a simple patch, I used the file originalfile with the content “These are a few words.” and the file updatedfile with the content “These still are just a few words.”. You will most probably get an output like this: 1c1 These still are just a few words. Of course, replace originalfile and updatedfile with the appropiate filenames of your case. Then, you could compare these files with diff, like this: ~]$ diff originalfile updatedfile You could, for example, write a few words in a normal text file, make some modifications, and then save the modified content to a second file. The most simple way of using diff is getting the differences between two files, an original file and an updated file.

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#BEST DIFF TOOL LINUX COMMAND LINE HOW TO#

This tutorial explains the basics of how to use these great commands.ĭifficulty: MediumThis tutorial assumes some basic Linux and command line knowledge, like changing directories, copying files and editing text files. They are widely used to get differences between original files and updated files in such a way that other people who only have the original files can turn them into the updated files with just a single patch file that contains only the differences. The commands diff and patch form a powerful combination.