急，shell字符串转义问题，请高手帮忙，谢谢。
定义字符串：
ttt="MT huihui" //firstofper1字符串中有空格导致下面的sub函数中"'$ttt'"语法错误，该怎么改，谢谢。
qqq="happy"
Fomatinfo="name:%s,ip:%s,port:%s."
firstofper0=`echo "$Fomatinfo" | awk '{sub(/%s/,"'$qqq'",$0); print}'`
echo $firstofper0
输出：name:happy,ip:%s,port:%s."
firstofper1=`echo "$Fomatinfo" | awk '{sub(/%s/,"'$ttt'",$0); print}'`
echo $firstofper1
语法错误
[解决办法]
echo $Fomatinfo
[解决办法]
sed "s/%s/$ttt/"
[解决办法]
firstofper1=`echo "$Fomatinfo"
[解决办法]
awk -v awk_var="$ttt" '{sub(/%s/,awk_var,$0); print}'
