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# pipe all output into a file user@localhost ~/currency $ /usr/local/bin/ruby bin/currencyd &> | tee stdout_with_stderr.log # tee all output into a file (as usual, tee output to console may lag, due to (not) flushing inside the program) user@localhost ~/currency $ /usr/local/bin/ruby bin/currencyd 2>&1 | tee stdout_with_stderr.log # pipe stdout (unix file descriptor 1) and stderr (unix file descriptor 2) into separate files user@localhost ~/currency $ /usr/local/bin/ruby bin/currencyd 1>stdout.log 2>stderr.log