Kalender Gregorian

Buatlah file dengan nama lahir.txt :

adi 42 5 1989
mega 21 3 1990
ridho 18 2 1989
wendy 15 10 1989
toni 27 12 1987
dika 18 6 1990
hera 10 12 1989
vonny 13 2 1989

Tuliskan rumus berikut dengan nama input.txt :

{
thn=$4-1;
bln=$3-1;
thk=thn/4;
if(thn%4==1){b=0.25}
if(thn%4==2){b=0.50}
if(thn%4==3){b=0.75}
d=thk-b;
thb=thn-d;

if(bln==0 && $4%4!=0){a=0}
if(bln==1 && $4%4!=0){a=31}
if(bln==2 && $4%4!=0){a=59}
if(bln==3 && $4%4!=0){a=90}
if(bln==4 && $4%4!=0){a=120}
if(bln==5 && $4%4!=0){a=151}
if(bln==6 && $4%4!=0){a=181}
if(bln==7 && $4%4!=0){a=212}
if(bln==8 && $4%4!=0){a=243}
if(bln==9 && $4%4!=0){a=273}
if(bln==10 && $4%4!=0){a=304}
if(bln==11 && $4%4!=0){a=334}

if(bln==0 && $4%4==0){a=0}
if(bln==1 && $4%4==0){a=31}
if(bln==2 && $4%4==0){a=60}
if(bln==3 && $4%4==0){a=91}
if(bln==4 && $4%4==0){a=121}
if(bln==5 && $4%4==0){a=152}
if(bln==6 && $4%4==0){a=182}
if(bln==7 && $4%4==0){a=213}
if(bln==8 && $4%4==0){a=244}
if(bln==9 && $4%4==0){a=274}
if(bln==10 && $4%4==0){a=305}
if(bln==11 && $4%4==0){a=335}

jum=(thb*365)+(d*366)+a+$2;

if(jum%7==1){print $0," ","Lahir Minggu"}
if(jum%7==2){print $0," ","Lahir Senin"}
if(jum%7==3){print $0," ","Lahir Selasa"}
if(jum%7==4){print $0," ","Lahir Rabu"}
if(jum%7==5){print $0," ","Lahir Kamis"}
if(jum%7==6){print $0," ","Lahir Jumat"}
if(jum%7==0){print $0," ","Lahir Sabtu"}
}

Masukkan instruksi berikut :
iam@iam-desktop:~$ awk -f input.txt lahir.txt

4. Outputnya :
yodie 12 3 1988 Lahir Sabtu
ridho 27 5 1989 Lahir Sabtu
angga 17 7 1989 Lahir Senin
inyonk 5 9 1987 Lahir Selasa
tyo 2 10 1988 Lahir Minggu
komting 8 4 1989 Lahir Rabu
andik 7 11 1988 Lahir Kamis
ilham 23 12 1988 Lahir Senin