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Open a file from within a Bourne shell Script

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http://www.unix.com – I am suppose to make a program that cuts the extension off of a file. It uses that .ext to decide which program needs to be used to open the file. This only finds the name of the program from a list of programs I made. My problem is when it has the name of the program it needs to use, how can I make the program open the file with code in the script. It is okay to assume that files will only have one period. Code so far: #!/usr/bin/bash -x FNAME=$1 export FNAME FILE_EXTENSION=`echo $FNAME | cut -f2 -d "."` a=`grep $FILE_EXTENSION dorc.sh` echo $a PROG=`echo $a | (HowTos)