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) User Commands tee(1)
NAME
tee - replicate the standard output
SYNOPSIS
tee [-ai] [file...]
DESCRIPTION
The tee utility will copy standard input to standard output, making a copy in zero or more files. tee will not buffer its output. The
options determine if the specified files are overwritten or appended to.
OPTIONS
The following options are supported.
-a Appends the output to the files rather than overwriting them.
-i Ignores interrupts.
OPERANDS
The following operands are supported:
file A path name of an output file. Processing of at least 13 file operands will be supported.
USAGE
See largefile(5) for the description of the behavior of tee when encountering files greater than or equal to 2 Gbyte ( 2**31 bytes).
ENVIRONMENT VARIABLES
See environ(5) for descriptions of the following environment variables that affect the execution of tee: LANG, LC_ALL, LC_CTYPE, LC_MES-
SAGES, and NLSPATH.
EXIT STATUS
The following exit values are returned:
0 The standard input was successfully copied to all output files.
>0 The number of files that could not be opened or whose status could not be obtained.
ATTRIBUTES
See attributes(5) for descriptions of the following attributes:
+-----------------------------+-----------------------------+
| ATTRIBUTE TYPE | ATTRIBUTE VALUE |
+-----------------------------+-----------------------------+
|Availability |SUNWcsu |
+-----------------------------+-----------------------------+
|CSI |Enabled |
+-----------------------------+-----------------------------+
|Interface Stability |Standard |
+-----------------------------+-----------------------------+
SEE ALSO
cat(1), attributes(5), environ(5), largefile(5), standards(5)
SunOS 5.10 20 Dec 1996 tee(1)