The Password Files
Let's call our two hypothetical Unix systems u1
and u2
.
Example 11-1 presents the
/etc/passwd
file from u1
.[2]
Example 11-1. u1 /etc/passwd file
root:x:0:0:root:/root:/bin/bash bin:x:1:1:bin:/bin:/sbin/nologin daemon:x:2:2:daemon:/sbin:/sbin/nologin adm:x:3:4:adm:/var/adm:/sbin/nologin tolstoy:x:2076:10:Leo Tolstoy:/home/tolstoy:/bin/bash camus:x:112:10:Albert Camus:/home/camus:/bin/bash jhancock:x:200:10:John Hancock:/home/jhancock:/bin/bash ben:x:201:10:Ben Franklin:/home/ben:/bin/bash abe:x:105:10:Honest Abe Lincoln:/home/abe:/bin/bash dorothy:x:110:10:Dorothy Gale:/home/dorothy:/bin/bash
And Example 11-2
presents /etc/passwd
from u2
.
Example 11-2. u2 /etc/passwd file
root:x:0:0:root:/root:/bin/bash bin:x:1:1:bin:/bin:/sbin/nologin daemon:x:2:2:daemon:/sbin:/sbin/nologin adm:x:3:4:adm:/var/adm:/sbin/nologin george:x:1100:10:George Washington:/home/george:/bin/bash betsy:x:1110:10:Betsy Ross:/home/betsy:/bin/bash jhancock:x:300:10:John Hancock:/home/jhancock:/bin/bash ben:x:301:10:Ben Franklin:/home/ben:/bin/bash tj:x:105:10:Thomas Jefferson:/home/tj:/bin/bash toto:x:110:10:Toto Gale:/home/toto:/bin/bash
If you examine these files carefully, you'll see they represent the various possibilities that our program has to handle:
Users for whom the username and UID are the same on both systems. This happens most typically with administrative accounts such as
root
andbin
.Users for whom the username and UID exist only on one system but not the other. In this case, when ...
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