sha1sum Command in Linux with Examples

DESCRIPTION

Print or check SHA1 (160-bit) checksums. It is commonly used to verify the integrity of files

SYNOPSIS

sha1sum [OPTION] [FILE]…
sha1sum [OPTION] –check [FILE]

OPTIONS :

-b, –binary
read files in binary mode (default on DOS/Windows)
-c, –check
check SHA1 sums against given list
-t, –text
read files in text mode (default)

The following two options are useful only when verifying checksums:
–status
don’t output anything, status code shows success
-w, –warn
warn about improperly formated checksum lines

EXAMPLES

1. To create a file with an sha1 hash in it, if one isn’t provided execute:

$ sha1sum filename [filename] ... > SHA1SUM

2. To verify the file was downloaded correctly you can execute:

$ sha1sum -c SHA1SUM
filename: OK
filename...: OK