怎么给文本空值添加“NA”

goofool

1. #centos6.5
   
2. echo -e "123\t456\t " | awk 'BEGIN{FS="\t"}{for(i=1;i<=NF;i++){if($i==" ")print "NA";else print $i}}'

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不靠谱

1. echo -e "123\t678\t \ndef\t \tabc" | sed -r 's/ +/NA/'

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