On 06Jun2015 21:53, bruce <badoug...@gmail.com> wrote:
Evening..

Morning...

As a test, the following is an attempt to replace "text" from a test
file with "text" from an external file.

aa=$(cat www1.txt)

BTW, this can be written:

 aa=$(< www1.txt)

sed -i "s*#\tISSUES/NOTES::*$aa*g" foo.py1

When I check the foo.py1 file, I get "$aa" in the file, instead of the
replacement text.

Are you sure you used the exact command above? If you have used single quote I would have expected such a result, but not with double quotes.

The test is using replacement delimeters for the sed, as the
replacement text has slashes...

I'm fond of ^G for this purpose:-)

thanks for any pointers.

When debugging sed scripts and other fiddly shell commands it is often useful to trace the actual executed command, thus:

 ( set -x; sed -i "s*#\tISSUES/NOTES::*$aa*g" foo.py1 )

which will should the issued sed command, after the shell has done its mangling.

Cheers,
Cameron Simpson <c...@zip.com.au>
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