Shell Programming and Scripting

 perl -F':' -alne 'BEGIN{print "First Name Last Name DOB POB"};if ($. % 4){$s.=$F[1]}else{$s=~s/^ //;print $s.$F[1];$s=""}' file

awk -F": " -vORS="" 'BEGIN{print "First Name Last Name DOB POB\n"}NR%4{print $2" ";next}{print "\n"}' file

awk -F": " 'BEGIN{print "First Name Last Name DOB POB"}{printf $2" "}!(NR%4){print ""}' infile

echo -e "First Name\tLast Name\tDOB\tPOB"
cut -d':' -f2 file | paste - - - -

awk -F":" '{print $2}' infile |xargs -n4

$ 
$ cat f3
First Name: Gary
Last Name: Larson
DOB: 01/01/2010
POB: US
First Name: Bill
Last Name: Waterson
DOB: 01/01/2009
POB: US
First Name: Scott
Last Name: Adams
DOB: 01/01/2007
POB: US
$ 
$ 
$ perl -ne 'BEGIN {print "First Name  Last Name  DOB  POB\n"}
            /^(First Name:|Last Name:|DOB:|POB:) (.*)$/ && do{print $2," "; $i++}; $i==4 && do{print "\n"; $i=0}' f3
First Name  Last Name  DOB  POB
Gary Larson 01/01/2010 US 
Bill Waterson 01/01/2009 US 
Scott Adams 01/01/2007 US 
$ 
$ 

$ 
$ perl -ne 'BEGIN {printf("%-12s %-12s %-12s %-12s\n","First Name","Last Name","DOB","POB")}
            /^(First Name:|Last Name:|DOB:|POB:) (.*)$/ && do{printf("%-12s ",$2); $i++}; $i==4 && do{print "\n"; $i=0}' f3
First Name   Last Name    DOB          POB         
Gary         Larson       01/01/2010   US           
Bill         Waterson     01/01/2009   US           
Scott        Adams        01/01/2007   US           
$ 
$