If you need to see a command’s or one of your script’s standard error and output in a log file and on your terminal simultaneously, take a look at this command:
$ command 2>&1 | tee command.log;
What does the numbers mean the following command? Here is the explanation:
| Name | File Descriptor | Description |
|---|---|---|
stdin |
0 | standard input stream (e.g. keyboard) |
stdout |
1 | standard output stream (e.g. monitor) |
stderr |
2 | standard error output stream (usually also on monitor) |
“2>&1” is telling us both standard error and standart output will be redirected together to standart output. After pipe, “tee” copies standard input to standard output or file.
References:
1-) http://stackoverflow.com/questions/13591374/command-output-redirect-to-file-and-terminal