expect 脚本：从 ifconfig 解析 ip 地址

Question

我正在尝试从 ifconfig 命令解析 IP 地址。当我在命令行上执行时它工作正常

pb791b@pb791b-VirtualBox:~/devtest/ngs/base/Tests/shellScripts$ ifconfig enp0s3 | sed -n '/inet addr/s/.*addr.\([^ ]*\) .*//p'
192.168.1.112

但是当我在 expect 脚本中使用它时出现错误。

#!/usr/bin/expect 

set pidBash [ spawn bash ]

set ipIfConfig {ifconfig enp0s3 | sed -n '/inet addr/s/.*addr.\([^ ]*\) .*//p'}
set clientIP [exec "echo $ipIfConfig"]
puts "clientIP = $clientIP" 
exit 1

输出为

pb791b@pb791b-VirtualBox:~/devtest/ngs/base/Tests/shellScripts$ ./ifconfig_parse.sh 
spawn bash
couldn't execute "echo ifconfig enp0s3 | sed -n '/inet addr/s/.*addr.\([^ ]*\) .*//p'": no such file or directory
    while executing
"exec "echo $ipIfConfig""
    invoked from within
"set clientIP [exec "echo $ipIfConfig"]"
    (file "./ifconfig_parse.sh" line 7)

Answer 1

这样试试：

set ip [exec ifconfig enp0s3 | sed -n {/inet addr/s/.*addr.\([^ ]*\) .*//p}]
puts ip=$ip

参见Command substitution and exec in Tcl的手册。

Answer 2

这里是提取ip的简洁明了的awk脚本

对于ip4：

ifconfig eno1 |awk '/inet /{print }'

对于ip6

ifconfig eno1 |awk '/inet6/{print }'

ip4 和 ip6

ifconfig eno1 |awk '/inet/{print $2}'

基本上脚本应该是：

set ip [ ifconfig eno1 |awk '/inet /{print }' ]

expect 脚本：从 ifconfig 解析 ip 地址

expect script: parse ip address from ifconfig

parsing

exec

expect