problems redirecting from system command

[smokinace]

i am trying to call a system command but can't redirect to a file.
#system ("/home/program", ">", "results/compared.txt");
it thinks the > is a parameter and won't run the program.

another possibility is using backticks
`/home/program > compared.txt`;
but i dont know how to to use variables with backticks.

any help would be appreciated

 

[ishnid]

What kind of variables?

Backticks will interpolate variables in the same way that double quotes will.

 

[smokinace]

i am trying to put variables directly into the command line for example:

`/home/program -i $gap > compared.txt`;

-i is the parameter with $gap being the number amount. the file is being created but nothing is being put in because of the variable. if a number is used then the program works correctly

 

[travs69]

Then post more code or print $gap right before the system call. Make sure $gap doesn't have a new line in it or anything. backticks does just find with variables. You can also use qx and create your own delimiters (plus I think it's easier to read than backtickets). qx~/home/program -i $gap > /full/path/to/compared.txt~
Please remember to provide full paths to everything.

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Travis - Those who say it cannot be done are usually interrupted by someone else doing it; Give the wrong symptoms, get the wrong solutions;

 

[smokinace]

it turns out putting the variable in double quotes inside the backticks treats them as an actual variable. who would have guessed.

thanks for the help