Linux Math Help

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# 1  
Old 11-11-2013
Linux Math Help

I am struggling with scripting this challenge a friend and I have.

You have file1 and its contents is a single number
you have file 2 and its contents are a different number

you want to add file1 to file2 and have the output be put into file3
# 2  
Old 11-11-2013
echo "`cat file1.txt` +  `cat file2.txt`" | bc > file3.txt

May have to add some bullet proofing like to bypass empty lines or insure the contents are a single number.
# 3  
Old 11-11-2013
I get an error:

line2: bc: command not found
# 4  
Old 11-11-2013
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