Sqlite beats linux utilities by a mile. Stack Overflow for Teams — Collaborate and share knowledge with a private group. Create a free Team What is Teams? Collectives on Stack Overflow. Learn more. Compare two files line by line and generate the difference in another file Ask Question. Asked 11 years ago. Active 1 year, 5 months ago. Viewed k times. Yarin k gold badges silver badges bronze badges.
Balualways Balualways 3, 9 9 gold badges 34 34 silver badges 51 51 bronze badges. I tried diff but it generates some numbers and other symbols in front of different lines that makes it difficult for me to compare files.
Add a comment. Active Oldest Votes. Remember that two files must be sorted and is unique — andy. You can group the options together: comm — Paolo M. What does "sorted" mean? That the lines have the same order?
Then it's probably fine for most use cases - as in, checking for what lines have been added by comparing with a backed-up older version. If newly added lines cannot be between the existing lines, that's more of an issue. EgorHans: if the file has e. That is "sorted" and both files must be sorted in a similar manner.
When the newer file has new lines it does not matter if they are "between existing lines" because after the sort they are not, they're in sorted order. Learn more. Two files comparison in bash script? Ask Question.
Asked 4 years, 3 months ago. Active 1 year, 5 months ago. Viewed 93k times. How to write it? Improve this question. Patrick Mevzek 2, 2 2 gold badges 17 17 silver badges 28 28 bronze badges. Have you try to use diff command? Add a comment. Active Oldest Votes. To just test whether two files are the same, use cmp -s :! If your two input files contains list of pathnames of files that you wish to compare, then use a double loop like so:!
It is assumed that no pathname in the two input files contain any embedded newlines. Improve this answer. The easiest way is to use the command diff. I need to run the laundry. I need to wash the dog. You can also use the diff command to compare binary files, but it will only tell you if the files are different unless you use the -s option. The cmp command tells you if two files are different and where the first difference appears. To illustrate just why we're getting this particular response with the second command above, you can use the od command to view the top of each of these files.
What you see below is the heading that is assigned to binary files. The content that represents the coding of these executables begins at the 25th byte. The comm command will display the differences in text files in a different format. In the example below, you can probably see that we're looking at three separate columns of output.
The first and second represent the first and second files. The third shows the lines which are the same in both of the two files. As you can see in the second example below, comparing a file to itself shows all of the output in column 3. Checksums can also tell you if files are different.
While this might not be advantageous when the files are on the same system, it can help a lot when they're on different systems. Sign up using Email and Password. Post as a guest Name. Email Required, but never shown. The Overflow Blog. Podcast Helping communities build their own LTE networks. Podcast Making Agile work for data science.
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