sha1sum Command in Linux with Examples

This tutorial explains Linux “sha1sum” command, options and its usage with examples.

sha1sum – compute and check SHA1 message digest

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]

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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

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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:

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

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If you wish to look at all Linux commands and their usage examples, go to Linux Commands Tutorial.

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Manish Bhojasia - Founder & CTO at Sanfoundry
Manish Bhojasia, a technology veteran with 20+ years @ Cisco & Wipro, is Founder and CTO at Sanfoundry. He lives in Bangalore, and focuses on development of Linux Kernel, SAN Technologies, Advanced C, Data Structures & Alogrithms. Stay connected with him at LinkedIn.

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