对文本的段落转成一行，以处理ansible结果为例

文本内容大致为：
exporter.log:

devops_monitor_prom_node-2 | CHANGED | rc=0 >>
root     26417 26416  0 02:27 pts/1    00:00:00 /bin/sh -c ps -ef |grep node_exporter
root     26419 26417  0 02:27 pts/1    00:00:00 grep node_exporter
gerrit1 | CHANGED | rc=0 >>
root     159753 159752  0 10:27 pts/4    00:00:00 /bin/sh -c ps -ef |grep node_exporter
root     159755 159753  0 10:27 pts/4    00:00:00 grep node_exporter
node_ex+ 201401      1  0 Jan08 ?        00:00:34 /usr/sbin/node_exporter --collector.textfile.directory /var/lib/node_exporter/te
xtfile_collector
gerrit_mirror | CHANGED | rc=0 >>
node_ex+ 120488      1  0 Jan08 ?        00:00:38 /usr/sbin/node_exporter --collector.textfile.directory /var/lib/node_exporter/te
xtfile_collector

要找到安装了node_exporter的hosts
把段落转成一行，按>>符号分隔
while read line ;do last2=echo ${line:0-2};if [ “$last2” == “>>” ];then echo ;echo -n $line;else echo -n $line;fi;done < ./exporter.log > 1exporter.log
过滤需要的结果
more 1exporter.log |grep “/usr/sbin/node_exporter”|awk ‘{print $1}’ > installed.log
得到到是主机名，把主机名转为ip
while read line ;do grep $line /etc/hosts|awk ‘{print $1}’;done < ./installed.log
得到ip列表。

将过程写成shell script

$ cat findIpsFromAnsibleLog.sh
#!/bin/sh
#$1:input a ansible log file
#$2:a key string to filter, only output hosts whose include key string.
#$3:if == "i" , filter will be inverse , only output hosts whose not include key string.
spliter=">>"
tmpfile="/tmp/ansible`date +%s`.1"
if [ "$1" == "" ];then #$1
  echo input an ansible log file to handle.
else #$1
  while read line ;do
    last2=`echo ${line:0-2}`;
    if [ "$last2" == "$spliter" ];then
      echo ;
      echo -n $line;
    else
      echo -n $line;
    fi;
  done < $1 > $tmpfile
if [ "$2" == "" ];then #$2
  awk '{print $1}' $tmpfile
else #$2
  if [ "$3" == "" ];then #$3
    grep "$2" $tmpfile | awk '{print $1}'
  else #$3
    grep -v "$2" $tmpfile | awk '{print $1}'
  fi #$3
fi #$2
fi #$1
rm $tmpfile