bash - reading multiple input files and creating matching output files by name and sequence

Question

I do not know much bash scripting, but I know the task I would like to do would be greatly simplified by it. I would like to test a program against expected output using many test input files.

For example, I have files named "input1.txt, input2.txt, input3.text..." and expected output in files "output1.txt, output2.txt, output3.txt...". I would like to run my program with each of the input files and output a corresponding "test1.txt, test2.txt, test3.txt...". Then I would do a "cmp output1.txt test1.txt" for each file.

So I think it would start like this.. roughly..

for i in input*;
do
    ./myprog.py < "$i" > someoutputthing;
done

One question I have is: how would I match the numbers in the filename? Thanks for your help.

@MortezaLSC: I believe OP accepted the answer below as it worked well for the problem posted. — anubhava
– anubhava, Commented Feb 10, 2014 at 8:10

choroba · Accepted Answer · 2014-02-10 07:54:20Z

1

If the input file name pattern is inputX.txt, you need to remove input from the beginning. You do not have to remove the extension, as you want to use the same for output:

output=output${i#input}

See Parameter Expansion in man bash.

answered Feb 10, 2014 at 7:54

choroba

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