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There are 4 alternatives - vote for the best!
Alternately for those without getent or only want to work on local users it's even easier:
cut -d: -f1 /etc/passwd|xargs -n1 passwd -e
Note that not all implementations of passwd support -e. On RH it would be passwd -x0 (?) and on Solaris it would be passwd -f.
This assumes that te original's 'passwd -e' forces a user to change password; it doesn't in the versions I have.
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