3
votes
1answer
51 views

How do I diff the outputs of two commands?

How can I use the diff command to compare 2 commands' outputs? Does something like this exist? diff ($cat /etc/passwd) ($cut -f2/etc/passwd)
1
vote
1answer
32 views

Assign diff -y column names

I have two files and a shell script. File 1: Batman Superman John Snow Jack Sparrow Rob Stark File 2: Batman Ironman Superman Spiderman John Snow Arya Stark Jack Sparrow Rob Stark The hound ...
4
votes
1answer
61 views

heuristically find how different a set of files are

I am having a large number of output files produced by repeated runs of a test suite and would like to see, approximately, how different they are. Ideally they should all be identical (indicating a ...
1
vote
0answers
50 views

Merge several files with maximum 1 line difference

Suppose I have the following files: file0.c: int b=NULL; int a=NULL; file1.c: int b; int a=NULL; file2.c: int b; int a=NULL; I am looking to merge the files file1 and file2 to generate the ...
1
vote
2answers
91 views

how to count number of differences in large streams quickly?

I want to count the number of differences (different bytes) in two large streams (devices/files). E.g. two hard disks, or one hard disk and /dev/zero. The program(s) involved must be fast, as fast ...
1
vote
2answers
96 views

Reduce redundant logfile

I often have longer redundant log files, redundant in the sense that blocks of text repeat with minor changes. The length of the files makes it difficult to spot the actual information. I had the idea ...
-1
votes
1answer
3k views

Bash function to compare two binary files [closed]

I need a function to compare 2 binary files, here the requirements: 2 files, not 3 or 4 files can't be assumed to exist avoid running checksum (CRC/MD5/SHA/...) until one must if running multiple ...
2
votes
1answer
1k views

Diff the output of two `awk` commands

I'm trying to compute the difference between the output of two awk commands but my simple attempts at it seem to be failing. Here is what I'm trying: diff $(awk '{print $3}' f1.txt | sort -u) $(awk ...
1
vote
1answer
65 views

Program to upgrade configuration files

When upgrading Ubuntu (and probably other *nixes), the upgrade process will show a diff of changed configuration files and ask whether I'd like to replace them, keep the old version, or manually merge ...
2
votes
2answers
490 views

Comparing files and their properties

I get information of a certain set of files in my mail every day, which looks like this: 58623208 Sep 14 20:08 blbn_blfbe_drv 57904920 Sep 14 19:54 blbn_cycmn 55814208 Sep 14 06:02 clsa_Upd 38912000 ...
9
votes
5answers
9k views

Output the common lines (similarities) of two text files (the opposite of diff)?

Diff is a great tool to display the changes between two files. But how to display the similarities of two text files (while ignoring the differences)? I.e. sample input: a: Foo Bar X Hello World 42 ...
10
votes
4answers
435 views

rolling diffs for storage of highly similar files?

At work we do a nightly dump of our mysql databases. From day to day, I would guestimate that close to 90-95% of the data is duplicate, increasing as time goes on. ( Heck at this point some are ...