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In order to get timestamp in history you have to export HISTTIMEFORMAT.

export HISTTIMEFORMAT='%F %T '

Try this one : perl -pi.bak -e "s#(.{2}$)##g;" info.txt

This is one liner perl code ...

my $example1="John Carey:507-699-5368:29 Albert way, Edmonton, AL 25638:9/3/90:45900";


if ($example1 =~ /(.*)(.{2}$)/ )
{
print "$1";
}
else
{
print "Not Matched";
}