从文件中我使用以下cmd检索最后一行;
tail -n 1 build.log
输出如下:
1477101542,,ui,say,--> amazon-ebs: AMIs were created:\n\nus-east-1: ami-63237174\nus-west-1: ami-21236841\nus-west-2: ami-27872347
我尝试在us-east-1:
,us-west-1:
&之后获取字符串us-west-2
使用以下grep命令:
echo | tail -n 1 build.log | egrep -m1 -oe 'us-east-1: ami-.{8}' | egrep -m1 -oe 'ami-.{8}'
我为每个条件运行此cmd三次。有更好的方法吗?
答案 0 :(得分:2)
如果区域出现的顺序是固定的,您只需执行以下操作:
$ echo | tail -n 1 build.log | egrep -o 'ami-.{8}'
ami-63237174
ami-21236841
ami-27872347
如果您要提取地区名称并且您有 GNU grep
,请尝试:
$ echo | tail -n 1 build.log | grep -Po 'us-[^:]+(?=: ami-.{8})'
us-east-1
us-west-1
us-west-2
获取两个区域名称和相关值:
$ echo | tail -n 1 build.log | egrep -o 'us-[^:]+: ami-.{8}'
us-east-1: ami-63237174
us-west-1: ami-21236841
us-west-2: ami-27872347