I have a handy-dandy script that replaces text in files. Very slick:
% replace 'dog' 'cat' myfile.txt 1. myfile.txt (1 change)
But I'd also like it to be able to act on a pipe if there is one:
% cat myfile.txt | replace 'dog' 'cat' My cat has fleas.
The problem is I don't want to use the diamond operator if the pipe is empty because it waits for keyboard input, and I don't want it to. Is there a way to check to see if there's anything coming down a pipe?
just put a hyphen on the commandline when you want to read from STDIN (e.g. piped input):
% cat myfile.txt | replace 'dog' 'cat' -
should work without any change to your code.
Randy.
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