md5 checksum for multiple files

create the checksum and verify them.
Example: file1.txt file2.txt file3.txt

# Linux
anthony.chin@jump.noc:~$ touch file{1,2,3}.txt
anthony.chin@jump.noc:~$ ll
total 129532
-rw-r--r-- 1 anthony.chin anthony.chin         0 Feb 10 07:06 file1.txt
-rw-r--r-- 1 anthony.chin anthony.chin         0 Feb 10 07:06 file2.txt
-rw-r--r-- 1 anthony.chin anthony.chin         0 Feb 10 07:06 file3.txt
anthony.chin@jump.noc:~$ for i in `ls file?.txt`; do md5sum $i > $i.md5; done
anthony.chin@jump.noc:~$ ll
total 129544
-rw-r--r-- 1 anthony.chin anthony.chin         0 Feb 10 07:06 file1.txt
-rw-r--r-- 1 anthony.chin anthony.chin        44 Feb 10 07:07 file1.txt.md5
-rw-r--r-- 1 anthony.chin anthony.chin         0 Feb 10 07:06 file2.txt
-rw-r--r-- 1 anthony.chin anthony.chin        44 Feb 10 07:07 file2.txt.md5
-rw-r--r-- 1 anthony.chin anthony.chin         0 Feb 10 07:06 file3.txt
-rw-r--r-- 1 anthony.chin anthony.chin        44 Feb 10 07:07 file3.txt.md5
anthony.chin@jump.noc:~$ md5sum -c *.md5
file1.txt: OK
file2.txt: OK
file3.txt: OK

# OSX
$ brew install cfv

$ touch file{1,2,3}.txt
$ ll
total 0
-rw-r--r--  1 anthony.chin  admin  0 Feb 10 15:12 file1.txt
-rw-r--r--  1 anthony.chin  admin  0 Feb 10 15:12 file2.txt
-rw-r--r--  1 anthony.chin  admin  0 Feb 10 15:12 file3.txt

$ for i in `ls file?.txt`; do md5 $i > $i.md5; done
$ ll
total 24
-rw-r--r--  1 anthony.chin  admin   0 Feb 10 15:12 file1.txt
-rw-r--r--  1 anthony.chin  admin  51 Feb 10 15:13 file1.txt.md5
-rw-r--r--  1 anthony.chin  admin   0 Feb 10 15:12 file2.txt
-rw-r--r--  1 anthony.chin  admin  51 Feb 10 15:13 file2.txt.md5
-rw-r--r--  1 anthony.chin  admin   0 Feb 10 15:12 file3.txt
-rw-r--r--  1 anthony.chin  admin  51 Feb 10 15:13 file3.txt.md5$ cfv *.txt
file1.txt.md5: 1 files, 1 OK.  0.000 seconds, 11.1K/s
file2.txt.md5: 1 files, 1 OK.  0.000 seconds, 18.8K/s
file3.txt.md5: 1 files, 1 OK.  0.000 seconds, 14.4K/s
3 files, 3 OK.  0.001 seconds, 7.6K/s

# if the md5 was incorrect:
$ vi file3.txt.md5
$ cfv *.txt
file1.txt.md5: 1 files, 1 OK.  0.000 seconds, 11.3K/s
file2.txt.md5: 1 files, 1 OK.  0.000 seconds, 17.6K/s
file3.txt : crc does not match (b026324c6904b2a9cb4b88d6d61c81d2!=b026324c6904b2a9cb4b88d6d61c81d1)
file3.txt.md5: 1 files, 0 OK, 1 badcrc.  0.000 seconds, 19.4K/s
3 files, 2 OK, 1 badcrc.  0.001 seconds, 7.8K/s