cksum 命令

常用示例

说明

cksum computes a cyclic redundancy check (CRC) checksum and byte count for each specified file, or for standard input if no file is given. It is part of GNU coreutils and is commonly used to verify file integrity after transfers or copies. By default, cksum uses the POSIX-standard 32-bit CRC algorithm. Modern versions of cksum (GNU coreutils 9.0+) support additional algorithms including MD5, SHA1, SHA256, and SHA512 via the --algorithm option, making it a versatile replacement for separate checksum utilities. The output format includes the checksum value, byte count, and filename. When using the --check option, cksum can read previously generated checksum files and verify that the listed files have not been modified.

参数

-a, --algorithm _name_

Select algorithm (crc, md5, sha1, sha256, sha512, etc.)

-c, --check

Read checksums and verify them

-l, --length _bits_

Digest length in bits

--base64

Output base64-encoded digest

--raw

Output raw binary digest

--tag

BSD-style checksum (default)

--untagged

Reversed style without digest type

-z, --zero

End lines with NUL instead of newline

--ignore-missing

Don't fail for missing files during check

--quiet

Don't print OK for verified files

--status

Silent mode, exit code shows result

-w, --warn

Warn about malformed checksum lines