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Read a file and create egrep variable

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# 1  
Old 02-25-2010
Read a file and create egrep variable
I want to create a egrep variable from a file.
For example:
Code:
string=`cat query.txt`
cat myfile.txt | egrep "$string"

The string variable file has a list of one or multiple lines
So the end result of:
Code:
cat myfile.txt | egrep "$string"

would be:
Code:
cat myfile.txt | egrep "test1|test20|test33"

I can not figure out how to read the file line by line and put a | between all but the last line and if the file only has one entry, to not put any |
# 2  
Old 02-25-2010
As a hint, perhaps:
Code:
$ cat file1
a
b
c
$ paste -sd\| file1
a|b|c

You have a lot of useless uses of cat there.
Code:
cat file | grep ...

can easily be done using
Code:
grep ... file

# 3  
Old 02-25-2010
Thank you Scottn, the paste command works for me.
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