How to find the checksum for a file in linux?

In Linux, you can use various commands and tools to find the checksum of a file. Checksums are used to verify the integrity of files and ensure that they have not been tampered with. Here are a few common methods to find the checksum of a file:

1. Using md5sum:

The “md5sum” command calculates and displays the MD5 checksum of a file.

md5sum filename

Replace `filename` with the actual name of your file. The output will be a 32-character hexadecimal number representing the MD5 checksum of the file.

2. Using sha1sum, sha256sum, sha512sum:

Similar to “md5sum”, you can use “sha1sum”, “sha256sum”, or “sha512sum” commands to calculate different types of SHA checksums.

For SHA-1 checksum:

sha1sum filename

For SHA-256 checksum:

sha256sum filename

For SHA-512 checksum:

sha512sum filename

3. Using sha3sum:

Some Linux distributions provide the `sha3sum` command to calculate SHA-3 checksums.

sha3sum filename

4. Using shasum on macOS:

On macOS, you can use the shasum command to calculate SHA checksums.

For SHA-1 checksum:

shasum -a 1 filename

For SHA-256 checksum:

shasum -a 256 filename

5. Using OpenSSL:

You can also use OpenSSL to calculate checksums.

For MD5 checksum:

openssl md5 filename

For SHA-1 checksum:

openssl sha1 filename

For SHA-256 checksum:

openssl sha256 filename

Always ensure you download checksums from a secure source to verify the integrity of your downloaded files.

Will the checksum of the file change if you change the permissions or ownership of the files in linux?

Changing the permissions or ownership of a file in Linux does not alter the file’s contents. Therefore, the checksum of a file will remain the same even if you change its permissions or ownership. Checksums are calculated based on the actual content of the file, not its metadata like permissions or ownership information.