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#!/bin/ksh
LIST="apple:22
oracle:23
kiwi:9999
pear:21"
FILE="/tmp/telnet_port_status"
cat /dev/null >${FILE}
for HST in ${LIST};do
HOST=$(echo ${HST}|awk -F: '{print $1}')
PORT=$(echo...

try this..
for i in $(ls);do
(echo "1,$ s:^:${i}<insert a tab>:g";echo "w";echo "q") | ed -s ${i}
done

this will open each file in the current dir, then from top to bottom of the file insert ...