Reading a variable line by line with while loop

[Ray Parrish]

Loïc Grenié wrote:
> 2009/12/1 Ray Parrish <crp at cmc.net>:
>   
>> Hello,
>>
>> I have been using while loops to read files in line by line when I want
>> to process things on a line oriented basis. Sometimes i have the set of
>> lines I want to read through already in a variable, and have to write
>> them to file before beginning to read line by line.
>>
>> I was wondering if it is possible to read a variable line by line
>> somehow with a while loop? Would it possibly be faster than using a file
>> to read from?
>>
>> I was thinking something along the lines of the following code might
>> work, but have not tested it yet.
>>
>> while read ThisLine; do
>>      # process each line
>>      echo "$ThisLine"
>> done < `echo "$Variable"`
>>
>> Is this something that might work, and would it be more efficient than
>> writing to, and reading from a file? Is there some other way I've missed
>> to make it work?
>>     
>
>     This will probably not work.
>
> echo "$Variable" | while read
> ...
> done
>
>     has better chances of working.
>
>            Loïc
>   
You are right, your method works, whereas mine did not. Thank you for 
the valuable pointer.

Here is what I got to work.

# read this script into the variable
Variable=`cat $0`
# Read each line in variable, and echo it to standard out.
echo "$Variable" | while read ThisLine; do
     # process each line
     echo "$ThisLine"
done

Thanks again, and later! Ray Parrish

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