Re: How can I check if a file exists in gawk?

Ed Morton schrieb:

>>>>I'm writing an awk script that takes a path as a variable using -v. In
>>>>the BEGIN section I need to parse
>>>>this file using:
>>>
>>>>while(getline < path)
>>>>{
>>>>:
>>>>:
>>>>}
>>>
>>>Why? There may be a better approach that doesn't involve getline.
>>
>>
>> Why? Err , because I have to read in the file line by line to extract
>> the fields to set up some mappings before I start processing the main
>> file in the { } section.
>
>That does not mean you need to use getline in the BEGIN section. The
typical way
>to do that instead is:
>
>awk '
>NR==FNR{ "populate mappings"; next }
>{ "main file processing" }
>' mappingFile mainFile

What is the typical way to do this if the both files needs different FS
or different FIELDWIDTHS?

Michael