Using kali linux and the rockyou wordlist.
$ unshadow passwd.txt shadow.txt > passwords.txt
$ john --wordlist=/usr/share/wordlists/rockyou.txt passwords.txt
$ john --show passwords.txt
passwords-hashcat.txt should contain only the hash.
$ hashcat -m 500 -a 0 -o cracked.txt passwords-hashcat.txt /usr/share/wordlists/rockyou.txt -O
$ cat cracked.txt