How to use ruby to extract a field
I am trying to write a ruby program that will open a file, extract the 15th field highlighted "|"
, and print that to the screen. I need to test it by doing the following (example):
cat /directory name/directory name/filename.rrf | less
and the 15th field of each line of this file will appear on the screen. Any help would be appreciated.
+3
Rachael hardison
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3 answers
File.open(filename).each do |line|
puts line.split('|')[14]
end
must do the trick.
+4
floum
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You don't need ruby for this.
echo "aaa,bbb,ccc" | cut -d ',' -f 2
# bbb
If you choose to use ruby, you can split the line like this:
"aaa,bbb,ccc".split(",")[1]
# bbb
You can also check stdlib CSV . See Parameter :col_sep
.
0
Jared beck
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Assuming you are using Unix line breaks ( \n
), do the following:
file = File.open("data", "r") # input filename goes here
data = file.read
file.close
lines = data.split(/\n/)
lines.each { |line|
p line.split(/\|/)[14]
}
For simplicity, the above code does not check if there are at least 15 fields on each line.
0
stj
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