The following works directly in my Mac OS X terminal, creating a file with a few lines:
awk '!/^1499\||^1598\||^1599\||^1999\||^2298\||^2299\||^2403\|/' "#{working_path}" > "#{filtered_file_path}"
However, when I attempt to use it in Ruby on Rails using backticks, the resulting file is empty:
`awk '!/^1499\||^1598\||^1599\||^1999\||^2298\||^2299\||^2403\|/' "#{working_path}" > "#{filtered_file_path}"`
An awk with a simple regex works. For example:
`awk '!/SMITH/' "#{working_path}" > "#{filtered_file_path}"`
So, the issue appears to be with the escaped pipe characters.
Ideas?
Some background I should have provided:
The file I am processing is pipe-delimited. I am filtering out lines with certain codes that are in the first value on the line. So, the regex I am using is something like ^2298\\|
.
The other pipes in the expression in single quotes are regex OR operators.
"working_path" and "filtered_file_path" are Ruby variables.
I just figured it out. The backslash that is escaping the pipe characters also needs to be escaped. Not sure why there is a difference between the regular Terminal and Ruby, but there it is. The working version:
`awk '!/^1499\\||^1598\\||^1599\\||^1999\\||^2298\\||^2299\\||^2403\\|/' "#{working_path}" > "#{filtered_file_path}"`
After challenging my assumption that the problem was Ruby on Rails, the accepted answer here is what explained it: Pipe symbol | in AWK field delimiter
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