awk 引入外部变量方法

1、获取普通外部变量

root@zabbix backup]# i=1

[root@zabbix backup]# awk i=”$i” ‘{print i}’ qlive.collect.sh 

awk: cmd. line:1: fatal: cannot open file `{print i}’ for reading (No such file or directory)

正确格式 awk ‘{action}’ 变量=’变量值’

awk ‘{print i}’ i=”$i” qlive.collect.sh 

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2、BEGIN语句中的变量

i=1

awk -v i=”$i” ‘BEGIN{print i}’

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3.获得环境变量

[chengmo@localhost ~]$ awk  ‘BEGIN{for (i in ENVIRON) {print i”=”ENVIRON[i];}}’
AWKPATH=.:/usr/share/awk
SSH_ASKPASS=/usr/libexec/openssh/gnome-ssh-askpass
SELINUX_LEVEL_REQUESTED=
SELINUX_ROLE_REQUESTED=
LANG=en_US.UTF-8