在shell脚本中插入一个数据，并再次创建一个新的空行

Question

下面是文件

中的数据

[dev01]
server7.srv.us.domain.net
server3.srv.us.domain.net
server2.srv.us.domain.net
server1.srv.us.domain.net

[dev02
server5.srv.us.domain.net

我需要grep dev01部分，并插入新的服务器详细信息(server9.srv.us.domain.net)行server1.srv.us.domain.net之后，再次使用shell脚本插入空行

Answer 1

Using awk:

awk -v tag="[dev01]" -v servline="server1.srv.us.domain.net" -v addline="server9.srv.us.domain.net" '$0 ~ tag { found=1 } found==1 && $0 ~ servline { $0=$0"n  "addline;found=0 }1' file > file.tmp && mv -f file.tmp file

解释:

awk -v tag="[dev01]" -v servline="server1.srv.us.domain.net" -v addline="server9.srv.us.domain.net" 
# Pass tag section to edit as tag, line to insert after a servline and actual line to insert as addline
'$0 ~ tag { 
found=1       # If line ($0) pattern matches to tag, set found to 1
} 
found==1 && $0 ~ servline { 
$0=$0"n  "addline;  # If found equal 1 and the current line is equal to servline, add a new line and the variable addline to the existing line
found=0              # Reset the found marker
}1' file > file.tmp && mv -f file.tmp file 
# Redirect output to temp file and move temp to original to commit the changes

如果您有最新版本的GNU awk，您不需要这样做，可以使用awk -i

使用sed:

sed '/[dev01]/,/[/{s/server1.srv.us.domain.net/server1.srv.us.domain.netn  server9.srv.us.domain.net/}' file

搜索从[dev01]到任何带有"["和过程。替代"server1.srv.us.domain.net"加上"server1.srv.us.domain.net"one_answers"server9.srv.us.domain.net"使用-i

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