![]() ![]() The above article on diff command in Linux will give you a clear understanding of how to use the diff command in Linux. They are generally used inline comparisons to identify the difference between them. It is to be noted that diff command in Linux uses a few special symbols and instructions which are needed in making two files similar.ĭiff command is a very useful command in comparing two files line by line. Diff command also helps in comparing the data between two directories. To ignore all the white space differences, we can use option -w along with diff command in Linux.ĭiff command in Linux helps in comparing the data between two files line by line and when any difference is found between the files then the differences will also be displayed along with the line numbers. There are some situations where there might be one or more white space differences in between the two files. We can see in the below screenshot that by using -b option in the diff command, the output has ignored the whitespaces. However, if we would like to ignore the white spaces in the two files, we can use the -b option. The white space difference is mentioned in the output. Here in the below screenshot, we can see that when no option is mentioned in the diff command, then To ignore the white space difference, we can use option -b as shown below. There are situations when two files are identical but there would a white space difference in the two files. ![]() So we can use option -s to display the message as shown below. In few situations, we would need to display the message if both the files are similar. So if we would need to ignore the case sensitive text, then we will need to use option -i as shown in the above screenshot. Here in the above screenshot, we can see that when there is no option mentioned in the first example, then the output displayed has shown the difference without ignoring the case sensitive data. If we would like to ignore any case sensitive in diff command, then we can use option -i in the argument as shown below. Generally, diff command in Linux is case sensitive. The symbol ‘-lemon’ will represent that the line would need to be added to the first file and the symbol ‘+orange’ will represent that the line would need to be removed from the first file to make it similar to the second file. The first file will indicate as three hyphens (“-“) and the second file will indicate with three-plus symbol in the output(“+++”). Here the output is more same with context format (option -c) but in option -u (unified format) the output will be displayed in a concise way, in the output the first 2 lines will represent that the file name with its changed time and date. When we use the option ‘-u’ in diff command, the result will be displayed in a unified format. When any file that does not need any modification then it is expected to be prefixed with two spaces. ![]() When the output has a single hyphen “-” that means the line will need to be removed and plus symbol “+” means the line would need to be added to the file. The first file will be represented with three stars (***) and the second file will be represented with three hyphens(-). Here in the output, the first two lines will give you the information of file names along with the modification dates of the two files. When we use option ‘c’ in diff command, the result will be displayed in context format. When there is a difference in both the files and when we use the diff command, the output will be displayed as shown below:Ĥc4 means that 4 th line in test1.txt should be changed to make the two files(test1.txt and test2.txt) the same. Now when we use the diff command for the above two files and when there is no result showed that means there is no difference between the above two files. Now we will compare them by using diff command. Let us consider there are two files test1.txt and test2.txt. Prints the options that are available and will exit This option will be treating all the files as text This option is used in ignoring any case diff in file data. It will recursively help in comparing any subdirectories that are found It will help in expanding the tabs to spaces in the output format. The output is displayed in two-column format It reports if two files are the same and have no differences between them The output displayed is a normal difference (the one that is displayed by default) –help command will give you all the options that are available for diff command in Linux. Options with their description are also mentioned below for better understanding. The result of the diff command in Linux can be in the below format:īelow are the options available in diff command in Linux. ![]()
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