perl or sed substitution

how would you use change the second field in the /etc/shadow file to change whatever is there to read !!nopasswd!! using either perl or sed ?
lolaferrariAsked:
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point_pleasantCommented:
awk -F: -v OFS=: '{$2 = "!!nopasswd!!"; print }' /etc/shadow
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point_pleasantCommented:
just as an aside if you don't want to replace root

awk -F: -v OFS=: '!/^root:/ {$2 = "!!nopasswd!!"}{ print }' /etc/shadow
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woolmilkporcCommented:
If the goal is locking out the user then under Solaris and Linux you can just run as root

passwd -l username
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lolaferrariAuthor Commented:
what is the difference between IFS and OFS?
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ozoCommented:
man bash
...
       IFS    The Internal Field Separator that is used for word splitting after expansion and to split lines into words with the read builtin command.  The default value is ``<space><tab><newline>''.

man awk
...
       OFS    output field separator (default blank)

So IFS is a separator in the shell (and perhaps some other programs) that is used when interpreting fields.
and OFS is a separator in awk (and perhaps some other programs) that is used when displaying fields.
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lolaferrariAuthor Commented:
I should have looked there to - thank you very much Ozo for the explanation.
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