[shell scipts] 1 số bài tập AWK đơn giản

bai 1: su dung awk in tat ca file /etc/passwd
awk '{print}' /etc/passwd
hoac co the viet
awk '{print $0}' /etc/passwd

bai 2: in ra cac dong co ten la 'kevin'
awk '/kevin/ {print}' /etc/passwd

bai 3: in ra cac trung dau tien cua file /etc/passwd
awk -F: '{print $1}' /etc/passwd

bai 4: in ra truong dau tien va sap xep theo bang chu cai
awk -F: '{print $1}' /etc/passwd | sort

bai 5: in ra truong 1,3,5 trong file /etc/passwd
awk -F: '{print $1,"\t",$3,"\t",$5}' /etc/passwd
hoac co the phan cach cac truong
awk -F: '{print $1,"--",$3,"--",$5}' /etc/passwd

bai 6: in dong thu 5 trong file /etc/passwd
awk "NR==5{print;exit}" /etc/passwd

bai 7: liet ke tat ca cac nguoi dung tren he thong dc ta bang lenh useradd
user tren he thong co 500<=id<=60000
awk -F: '$3>=500 && $3<=60000{print $1""$3}' /etc/passwd