sha1sum - compute and check SHA1 message digest

syntax

$ sha1sum [OPTION] [FILE_NAME]

To create the SHA-1 of a file

$ sha1sum example.txt

To create the SHA-256 of a file

$ sha256sum example.txt

To write the SHA-1 of a file to a file

$ sha1sum example.txt > example.sha1

add some contents to example.txt

and check with

$ sha1sum -c example.sha1

example.txt: FAILED
sha1sum: WARNING: 1 computed checksum did NOT match

updated the SHA-1 file against the example.txt

$ sha1sum new.txt > example.sha1
$ sha1sum -c example.sha1

example.txt: OK

To forcefully change the command’s capabilities to read in binary mode

$ sha1sum -b example.sha1

To print help commands

$ sha1sum - -help

To get a list of other sha-related commands

$ sha

regards,

T.Dhanasekar