How to expand shell variables in a text file?

Question

Consider a ASCII text file (lets say it contains code of a non-shell scripting language):

Text_File.msh:

spool on to \'$LOG_FILE_PATH/lo         


        

Answer 1

If the variables you want to translate are known and limited in number, you can always do the translation yourself:

sed "s/\$LOG_FILE_PATH/$LOG_FILE_PATH/g" input > output

And also assuming the variable itself is already known