Linux - awk 文本处理工具四

awk 常用示例

获取本机 IP 方式

/sbin/ifconfig |awk -v RS="Bcast:" '{print $NF}'|awk -F: '/addr/{print $2}'
# 直接获取当前 IP 地址 
/sbin/ifconfig |awk '/inet/&&$2!~"127.0.0.1"{split($2,a,":");print a[2]}'
# 也是 直接获取当前 IP 地址
/sbin/ifconfig |awk -v RS='inet addr:' '$1!="eth0"&&$1!="127.0.0.1"{print $1}'|awk '{printf"%s|",$0}'
# 输出 网卡名称 和当前配置IP 地址
/sbin/ifconfig |awk  '{printf("line %d,%s\n",NR,$0)}'    
# 默认是  输出所有的网卡信息
# 可以直接指定网卡或者定义类型(%d数字,%s字符)

看磁盘空间方式

df -h|awk -F"[ ]+|%" '$5>14{print $5}'
# 使用量 百分比
df -h|awk 'NR!=1{if ( NF == 6 ) {print $5} else if ( NF == 5) {print $4} }' 
# 依次分行显示各个分区的使用 百分百比
df -h|awk 'NR!=1 && /%/{sub(/%/,"");print $(NF-1)}'
# 依然依次显示 各个分区使用量的百分比 
df -h|sed '1d;/ /!N;s/\n//;s/ \+/ /;'    
# df -h 精简显示
# 将磁盘分区整理成一行   可直接用 df -P

排列打印

awk 'END{printf "%-10s%-10s\n%-10s%-10s\n%-10s%-10s\n","server","name","123","12345","234","1234"}' txt
awk 'BEGIN{printf "|%-10s|%-10s|\n|%-10s|%-10s|\n|%-10s|%-10s|\n","server","name","123","12345","234","1234"}'
awk 'BEGIN{
print "   *** 开 始 ***   ";
print "+-----------------+";
printf "|%-5s|%-5s|%-5s|\n","id","name","ip";
}
$1!=1 && NF==4{printf "|%-5s|%-5s|%-5s|\n",$1,$2,$3" "$11}
END{
print "+-----------------+";
print "   *** 结 束 ***   "
}' txt