[TriLUG] solved: HERE document question

[Joseph Mack NA3T]

On Mon, 26 Jul 2010, Kevin Hunter wrote:

> Since no one seems to be stepping forward with a "Here's 
> your answer, Joe!", may I suggest you post your script in 
> it's entirety to a pastebin service, and let folks take a 
> look.  Explanations are great, but sometimes there's no 
> substitute for code.

I did it by brute force. I needed the generating script to 
sometimes substitute the value of a variable in the 
HERE document. You do this with

partition=/dev/sda1
cat > $filename <<EOF
 	echo "$partition"
EOF

when $filename will contain

echo "/dev/sda1"

Sometimes I needed the name of the variable, and not the 
value, in the HERE document. You do this with

cat $filename> <<\EOF
 	if [ "$count" = "0" ]
EOF

when $filename will contain

 	if [ "$count" = "0" ]

I couldn't find any finer control of whether a variable 
would be substituted or written as is. I wrote the 
generating script to piecewise output strings as 5 separate 
HERE documents (some with variables substituted and some 
wrtten literally) which were cat'ed into the final file.

Thanks Joe

-- 
Joseph Mack NA3T EME(B,D), FM05lw North Carolina
jmack (at) wm7d (dot) net - azimuthal equidistant map
generator at http://www.wm7d.net/azproj.shtml
Homepage http://www.austintek.com/ It's GNU/Linux!