我在tcl错误中遇到错误foreach行错误#args：应该是＆＃34; foreach varList list？varList list ...？命令＆＃34;

Question

变量缓冲区=＆＃34; nohup tcpdump -ni eth0 -s0 2＆gt;＆amp; 1

实际上我正在搜索变量中的数字，我的代码是

foreach line [split $buffer "\n"]
{     
if {[regexp {\[\d\]\s+(\d+)} $line junk pid]}
break 
}  
if {[info exists $pid]} 
{puts "PID of nohup is $pid}

我收到的错误是：错误#args：应该是＆＃34; foreach varList list？varList list ...？命令＆＃34;执行＆＃34; foreach line $ lines {＆＃34; foreach命令有什么问题请帮我解决正确的代码