输入文件sample.txt
some log file entries
some log file entries
Hostname:MyHostName
some log file entries
some log file entries
我必须改变MyHostname字符串
该命令不起作用
sed -e 's/^Hostname: .*:/Hostname:mmphate/' sample.txt
sed -e 's/^Hostname: .*$/Hostname:mmphate/' sample.txt