linux命令-awk

linux命令-awk

熟悉awk和print文法

fuhui@ubuntu:~$ ls -lh | awk '{print $5 }'

BEGIN和END被包裹在一個單引號內

fuhui@ubuntu:~$ ls -lh | awk 'BEGIN { count=0; print "start:" count}' 'END { print "total:" , count}'start:0fuhui@ubuntu:~$ ls -lh | awk 'BEGIN { count=0; print "start:" count} END { print "total:" , count}'start:0total: 0

在BEGIN和END之間插入語句

fuhui@ubuntu:~$ ls -lh | awk 'BEGIN { count=0; print "start:" count} {count=count+$5; print count} END { print "total:" , count}'

邏輯段之間使用分號相隔。END和BEGIN後緊跟{}比較美觀

awk -F ':' 'BEGIN{ count=0 } { name[count]=$1; count=count+1 } END{ for(i=0;i<nr;i++) print="" i="" name[i]}'="" etc="" passwd