➜ ~ echo -n 'admin' | md5sum
21232f297a57a5a743894a0e4a801fc3 -
➜ ~ md5sum -h
md5sum: invalid option -- 'h'
Try `md5sum --help' for more information.
➜ ~ md5sum --help
Usage: md5sum [OPTION]... [FILE]...
Print or check MD5 (-bit) checksums.
With no FILE, or when FILE is -, read standard input. -b, --binary read in binary mode
-c, --check read MD5 sums from the FILEs and check them
-t, --text read in text mode (default)
Note: There is no difference between binary and text mode option on GNU system. The following three options are useful only when verifying checksums:
--quiet don't print OK for each successfully verified file
--status don't output anything, status code shows success
-w, --warn warn about improperly formatted checksum lines --help display this help and exit
--version output version information and exit The sums are computed as described in RFC . When checking, the input
should be a former output of this program. The default mode is to print
a line with checksum, a character indicating type (`*' for binary, ` ' for
text), and name for each FILE. Report md5sum bugs to bug-coreutils@gnu.org
GNU coreutils home page: <http://www.gnu.org/software/coreutils/>
General help using GNU software: <http://www.gnu.org/gethelp/>
For complete documentation, run: info coreutils 'md5sum invocation'