NF、$NF、FR、FNR举例说明

NF当前处理数的个数

[[email protected]_207_144_centos bin]# echo a b c | awk ‘{print NF}‘

3

$NF当前处理数中的最后一位数

[[email protected]_207_144_centos bin]# echo a b c | awk ‘{print $NF}‘

c

FR当前处理行中的所指定的行数

[[email protected]_207_144_centos bin]# curl "http://127.0.0.1/nginxstatus" 2> /dev/null | awk NR==2 | awk ‘{print $3}‘

handled

[[email protected]_207_144_centos bin]# curl "http://127.0.0.1/nginxstatus"

Active connections: 1

server accepts handled requests

148 148 148

Reading: 0 Writing: 1 Waiting: 0

FNR当前处理行的行数

[[email protected]_207_144_centos bin]# curl "http://127.0.0.1/nginxstatus" 2> /dev/null | awk ‘{print FNR}‘

1

2

3

4

[[email protected]_207_144_centos bin]# curl "http://127.0.0.1/nginxstatus" 2> /dev/null | awk NR==2 | awk ‘{print FNR}‘

1