I have an issue. On giving the following on the prompt:
md5sum -c 1.txt

I get the report as:

usage: md5sum [-bv] [-c [file]] | [file…]
Generates or checks MD5 Message Digests
-c check message digests (default is generate)
-v verbose, print file names when checking
-b read files in binary mode
The input for -c should be the list of message digests and file names
that is printed on stdout by this program when it generates digests.

What am I doing wrong. Please note the content of 1.txt is as below:

2e399d5b1db279126728ffac439cfe2c temp.pdf