In bash, calling
foo would display any output from that command on the stdout.
foo > output would redirect any output from that command to the file specified (in this case 'output').
Is there a way to redirect output to a file and have it display on stdout?
The command you want is named
foo | tee output.file
For example, if you only care about stdout:
ls -a | tee output.file
If you want to include stderr, do:
program [arguments...] 2>&1 | tee outfile
2>&1 redirects channel 2 (stderr/standard error) into channel 1 (stdout/standard output), such that both is written as stdout. It is also directed to the given output file as of the
Furthermore, if you want to append to the log file, use
tee -a as:
program [arguments...] 2>&1 | tee -a outfile