"Linux command-File management class" CMP command

CMP (Compare) command

Command function: Compare the differences between two files
Command usage: CMP [-clsv][-i < number of characters >][–help][first file] [second file]

When the two files that are compared to each other are identical, the instruction does not display any information;
If found to be different, the preset will indicate the first difference in the character and column number;
If you do not specify any file name or the given file name is "-", the CMP instruction will read the data from the standard input device.

Command parameters:

• -C or –print-chars displays the corresponding character of the character in addition to the decimal loadline that indicates the difference.
• -i< number of characters > or –ignore-initial=< characters > Specify a number.
• The-L or –verbose mark all the different places.
• -S or –quiet or –silent do not display an error message.
• -V or –version displays version information.
• Help online Help.

Example:

First prepare two files file1 and File2,

1. Compare File1 and File2:

Without parameters, the CMP instruction compares the first two file differences and outputs the first few bytes, the 1th row in the example, and the 5th byte in a different order.

2. Use the-c parameter to display the differential characters

3. Use the-l parameter to compare two files all different places

The first column is the byte position, and the 2nd, 3 columns are octal bytes

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"Linux command-File management class" CMP command