01-15-2009
Outside of the script, all the script's io is piped to 'tee' and so it is only done the one time.
Inside the script you would have to pipe all your commands that might produce output to 'tee' to get your desired result.
Basically in the script you wrote, only the 'exec' command was piped to 'tee' and as a result only it's ouput was "written" to test.log, and therefore you have an empty file.
If you had piped 'pwd' to 'tee' instead you would have gotten output in your log file.
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tee(1) General Commands Manual tee(1)
NAME
tee - pipe fitting to copy standard output to file
SYNOPSIS
[file]...
DESCRIPTION
The command transcribes the standard input to the standard output and makes copies in the files.
Options
This option ignores interrupts.
This option appends the output to the
files rather than overwriting the files.
EXTERNAL INFLUENCES
Environment Variables
determines the language in which messages are displayed.
If is not specified in the environment or is set to the empty string, the value of is used as a default for each unspecified or empty vari-
able. If is not specified or is set to the empty string, a default of "C" (see lang(5)) is used instead of
If any internationalization variable contains an invalid setting, behaves as if all internationalization variables are set to "C". See
environ(5).
International Code Set Support
Single- and multibyte character code sets are supported.
RETURN VALUE
The command returns zero upon successful completion, or nonzero if the command fails.
EXAMPLES
Write a list of users to the screen and also append the list to the file
STANDARDS CONFORMANCE
tee(1)