Reading a variable line by line with while loop

[Ray Parrish]

NoOp wrote:
> On 12/01/2009 01:40 AM, Ray Parrish wrote:
>   
>> 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?
>>
>> Thanks for any help you can be.
>>
>> Later, Ray Parrish
>>
>>     
>
> I think that your continued learning experience with bash/command
> line/scripts et al is educational (to some), but what/how are all of
> these posts from you related to Ubuntu technical support, and more
> specifically to this list?
>   
Damned if I know... I just figured this was a good forum to discuss bash 
scripting since it is such an inherent part of Ubuntu that without 
learning it you really cannot administer your machine as easily.

Currently I'm working on a bash history manager, and bash based all 
around bash manager. When I'm done with it, it will be able to 
interactively run bash commands either from the history list, or from 
being typed in, and will output all the normal output any good or bad 
command would put out.

It will also provide a GUI interface to the settings in ~/.bashrc, and 
if I can figure out how to do it, will be able to run down through the 
bash history, testing each command for success, or failure, and weeding 
out the lines that are not syntactically correct by parsing the stderr 
output for clues.

I do have a tech support question that I'll leave for another thread, 
but it is a request for a bash command to find the script responsible 
for attempting to start my firewall a second time during boot up causing 
a "Fail" message because it is already started. 8-) Got a one liner that 
covers discovering which scripts actually run the command on start up?

Later, Ray Parrish

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