I have a file called hello.txt with following content:
hello
When I execute a linux crc32 on that file like this: (I installed via sudo apt install libarchive-zip-perl)
crc32 hello.txt
I get:
363a3020
When I want to use some online calculator or npm library (crc from node.js), I execute that on text only and get the following result:
3610a686
Which is different. How could I check this so that the results are the same ? What is the difference here ? Can someone explain ?
It looks as if you created the file by running something like:
echo hello > hello.txt
The echo command appends a newline character, so the content of that file is actually hello<newline>. We can see that with a hexdump tool, for example:
$ od --endian=big -x hello.txt
0000000 6865 6c6c 6f0a
0000006
Or by just counting bytes:
$ wc -c hello.txt
6 hello.txt
Here we see it's 6 bytes instead of the expected 5 bytes. If we suppress the terminal newline:
echo -n hello > hello.txt
We then get the expected crc:
$ crc32 hello.txt
3610a686