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-i option is for in place edition without redirection
but i don't get why it is not working for you...
anyway try this one...

#!/bin/sh
sed -n '/[0-9][0-9]\/[0-9][0-9]\/[0-9][0-9][0-9][0-9]/p'...

Try:
#!/bin/sh
tm=`TZ=GMT date +%H`
/usr/xpg4/bin/awk "/^$tm:/{print;if(getline)print}" af02_alarm_log.31082010 > /tmp/HLR_alarm.txt
or alternatively replace last line with:
/usr/xpg4/bin/sed...