Password Field in /etc/passwd

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http://www.linuxquestions.org – Hi, I have just found that the password filed in /etc/passwd is having an exclamation mark "!" instead of an "x" in there. It is an AIX 5.3 box. Code: UserName:!:100020:1:"Mr. User":/home/UserName:/usr/bin/ksh Here is a line from the same file from a Fedora Box: Code: xyz:x:505:506::/home/xyz:/bin/bash So, what does the mark "!" mean there on an AIX Box in the /etc/passwd file after the user account name? (HowTos)