PROBLEM: You want to develop a hand reference to various constants and
do not wish to have two have the program and data files separate

The solution is to use "here is list" as a part of your program.


$ cat GetConstant
grep -i $1 <<\EOF      #Traditionally only <<EOF is used. <<\EOF prevenst
                       #parameter expansion in the "here is list"
c 3E10
h 6.63E-27
G 6.67E-8
Msun 2E33
Lsun 4E33
Rsun 7E10
AU   1.496E13
EOF

$ chmod +x GetConstant

$ ./GetConstant h
$ ./GetConstant sun