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You could set up two or more usernames with the password file entries specifying the same userID, groupID, home directory, etc., but have a different password for each.

Giving a user two...

Try: perl -pe 's/\b\d:\d\d:\d\d\b/0$&/g' file

Try this for your second scenario

awk '/PM/{split($6,_1,":");$6=_1[1]+12":"_1[2]}/AM|PM/{$6=$6":00";$7=$8;NF=7}1' infileregards,
Ahamed

Try this

sed 's/\(Date:.*, \)\([Aa-Zz]..\) \([0-9].\)\(.*\)/\1\3 \2\4/g' inputfile

regards,
Ahamed