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/etc/shadow 2nd column with !!

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Operating Systems Linux /etc/shadow 2nd column with !!
# 1  
Old 09-23-2008
/etc/shadow 2nd column with !!
Hi All,

I have this /etc/shadow below:



dbus:!!:14063:0:99999:7:::
vcsa:!!:14063:0:99999:7:::
rpm:!!:14063:0:99999:7:::
haldaemon:!!:14063:0:99999:7:::
netdump:!!:14063:0:99999:7:::
nscd:!!:14063:0:99999:7:::
sshd:!!:14063:0:99999:7:::
rpc:!!:14063:0:99999:7:::
mailnull:!!:14063:0:99999:7:::
smmsp:!!:14063:0:99999:7:::
rpcuser:!!:14063:0:99999:7:::
nfsnobody:!!:14063:0:99999:7:::
pcap:!!:14063:0:99999:7:::
apache:!!:14063:0:99999:7:::

What does !! mean on the second column? Is it password or can the userid login or what?

Thanks in advance.
# 2  
Old 09-23-2008
Hi
If i remember
1 Is name user or name service
2 can be crypted password or * or ! or !!
(*,!!,!)is string flag to inform as system process or daemon process and other elements ....
3 is userid
To really understand
execute man adduser , after some learn
make several type users and open /etc/shadow to observe relation effect resulting
also see /etc/include/shadow.h for struct ....
Best regards
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