awk '{print "wang"}' /etc/fstab
awk '{print 3*4}' /etc/fstab
awk -F':' '{print $1":"$3}' passwd
df | grep '^\/dev'|awk -F' +|%' '{print $5}'
df | awk -F' +|%' '/^\/dev/{print $5}'
awk -v FS=":" '{print $1 FS $3}' passwd
awk -v FS=":" -v OFS="+++" '{print $1,$3}' passwd
echo "a,b,c;1,2,3;x,y,z" | awk -v RS=";" '{print $1}' 
echo "a,b,c;1,2,3;x,y,z" | awk -v RS=";"-v FS="," {print $1}
awk '{print $0}' passwd
ifconfig | awk 'NR==2'
awk '{print NR" "$0}' passwd
nl passwd
cat -n passwd
awk '{print NR" "$0}' /etc/fstab /etc/inittab
awk '{print FNR" "$0}' /etc/fstab /etc/inittab
awk '{print ARGV[0]}' /etc/fstab
awk -F: '{printf "%-20s\n",$1}' passwd
awk -v i=1 'BEGIN{pring i++,i}'
awk '$0 ~ /^#/' /etc/fstab
awk '$0 !~ /^#/' /etc/fstab

awk -F: '{$3>=1000?usertype="Common User":usertype="SysUser";printf "%-20s:%-12s\n",$1,usertype}' passwd

seq 10 | awk 'i=!i'

awk -F: '{if($3<=100){print "<=100",$3}else if ($3<=1000) {print "<=1000",$3}else{print "<=1000",$3}}' passwd

ss | awk 'NR!=1{print $1}'|awk '{state[i]++}{for (i in state)print i,state[i]}'

awk 'BEGIN{system ("hostname")}'