Linux修改文件第一行

#输入MAC地址
echo -n -e “Please scan MAC Address:”
#把输入的字符串读取到macAddress
read macAddress
#把MAC冒号替换空格
trmacAddress=${macAddress//😕 }
#文件
filename=8168HEF.cfg
#行号
linenumber=1
#修改内容字符串
newcontent=“NODEID = ${trmacAddress}”
echo KaTeX parse error: Expected 'EOF', got '#' at position 12: newcontent #̲修改 sed -i "{linenumber}s/^.*$/${newcontent}/" $filename