如何检查 shell 脚本中是否已创建警告横幅

Question

运行显示已使用 if else 语句创建警告横幅的脚本需要哪些命令？

例如：

If [something == something]
   echo " Banners created"
else
   echo "Banners not created"
   echo " Details: "
   echo $( /bin/ls -l /etc/motd)

Answer 1

if grep -q 'mywarning' /etc/motd; then
    echo " Banners created"
else echo "Banners not created"
    echo " Details: $(/bin/ls -l /etc/motd)"
fi