Detailed analysis of Linux diff command usage

Linux diff Function Description: Diff compares the similarities and differences of text files in line-by-line mode. If you specify a directory to be compared, diff compares the files with the same file name in the directory, but does not compare the subdirectories.
Synopsis
Diff [Options] From-file to-file
Syntax: diff [-abbcdefhilnnppqrsttuvwy] [-<number of rows>] [-C <number of rows>] [-D <giant Set Name>] [-I <character or string>] [-S <File >] [-W <width>] [-x <file or directory>] [-x <File>] [-- help] [-- left-column] [-- suppress-common -Line] [file or directory 1] [file or directory 2]

Parameters:
-X <file name or directory> or -- exclude <file name or directory> does not compare the files or directories specified in the option.
-X <File> or -- exclude-from <File> you can save the file or directory type as a text file and specify the text file in = <File>.
-Y or -- side-by-side displays Similarities and Differences of files in parallel.
-- Help: displays help.
-- When left-column uses the-y parameter, if the content of a row in the two files is the same, only the content of the row is displayed in the left column.
-- Suppress-common-lines only show differences when using the-y parameter.
-T or -- expand-Tabs expand the Tab character in the output.
-T or -- Initial-tab Add a Tab character before each line for alignment.
-U,-u <Number of columns> or -- uniied = <Number of columns> are combined to display different file content.
-V or -- version displays version information.
-W or -- ignore-all-space ignores all space characters.
-W <width> or -- width <width> when you use the-y parameter, specify the column width
-P if the file to be compared is in C Language Program The function name of the difference.
-P or -- unidirectional-New-file is similar to-N, but only when the second directory contains files not in the first directory, to compare this file with a blank file.

-Q or -- Brief only shows no difference and does not show detailed information.
-R or -- Recursive compares files in the subdirectory.
-S or -- Report-identical-files are still displayed if no difference is found.
-S <File> or -- Starting-file <File> compares directories from specified files.
-H or -- speed-large-files can accelerate the speed of large files.
-L <character or string> or -- ignore-matching-lines <character or string> If the two files have different lines, these lines both contain the characters or strings specified in the options, so the differences between the two files are not displayed.

-I or -- ignore-case do not check the case sensitivity.
-L or -- paginate submits the result to the PR program for paging.
-N or -- RCS: The comparison result is displayed in the format of RCS.
-N or -- New-file:
Only in Directory: If file a uses the-n parameter, diff compares file a with a blank file.
-C: display all internal text and mark the differences.
-C <number of rows> or -- Context <number of rows> is the same as executing the "-C-<number of rows>" command.
-D or -- minimal use different models Algorithm In a small unit.
-D <collection Name> or ifdef <collection Name> the output format of this parameter can be used for the frontend processor collection.
-E or -- ed the output format of this parameter can be used in the script file of Ed.
The format output by-f or-forward-ed is similar to that output by Ed script files, but different places are displayed in the order of the original files.
-<Number of lines> specify the number of lines of text to be displayed. This parameter must be used with the-C or-u parameter.
-A or -- text DIFF: by default, only text files are compared row by row.
-B or -- ignore-space-change do not check the difference of space characters.
-B or -- ignore-blank-lines do not check blank lines.