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use awk with -v option
ps -aef|grep httpd|awk ' { print $2 , $5 } ' | cut -d ':' -f1 | awk -vT=`date -d '1 hour ago' "+%H"` ' $2<T {print $1}'

change your two lines

1) combine the grep and awk
2) use while loop instead of for loop

ps -aef | awk '/httpd/{ print $2 , $5 } ' | cut -d ':' -f1 > /root/output.txt
awk -v t="$T" '$2<t...