#判断命令是否存在
function cmd_exists() {
local ret='0'
command -v $1 >/dev/null 2>&1 || { local ret='1'; }
# fail on non-zero return value
if [ "$ret" -ne 0 ]; then
return 1
fi
return 0
}
#检查是否安装telnet
if $(cmd_exists telnet);then
echo "telnet found"
else
echo "telnet not found,please install telnet!"
exit 1
fi
