01-03-2020
Yes, the value of
outvar will just hold all the content of your file. You might prefer to process the variable or create another by reading the file in a different way. It's up to you, but you can use many ways to read specific things. For example:-
- To read the 3rd line, this would do sed -n3p This could be written as third_line="$(printf "%s" "${outvar}" | sed -n3p)" or third_line="$(sed -n3p filename)" depending
- To set a value if your file is null, you could [ ! -s filename ] && variable=0
- To set a value if your variable is null, you could [ -z "${outvar}" ] && outvar=0
- To scan for non-numerics and set the value to zero, you could attack it in several ways, e.g. delete the digits from the string and see if there's anything left; try to add zero and check the return code (writing all output/error messages to /dev/null to keep it clean) etc. etc. It depends what makes sense to you.
Does this help you sanity check your data?
Robin
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