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oh, no!! please, don't test a bash script calling it with sh anyscriptit'll use sh as the interpreter
call it the proper way./anyscriptlet the shebang do its job

#!/bin/bash

#set deli = '|'
deli="|"
#set ppattern = ""
#foreach i(`cat pattern`)
for i in $(<pattern)
#set ppattern = "$i$deli$ppattern"
do ppattern="$i$deli$ppattern"
echo $ppattern
#end...

Use the mv command with one of the examples like:
egrep 'ccc|ddd' test.txt > another_file && mv another_file test.txt

try this

set ff=$rr$rr1

Hi
Put backticks:

set rr=`echo $tt | cut -d”_” -f1`

Guru.