I'm looking to replace the fourth column in a CSV if it equals N/A
. I'm trying to change it to -1
.
I can't seem to get this to work.
awk -F , '{ if($4 == "N/A") {$4 = -1} }' test.csv
You can use the following awk
:
awk -F, '{ $4 = ($4 == "N/A" ? -1 : $4) } 1' OFS=, test.csv
,
to preserve the delimiters in your csv file-1
if not we retain the value as is. 1
at the end prints your line with or without modified 4th column depending if our test was successful or not. ($4=="N/A"?-1:$4)
is a ternary operator that checks if the condition $4=="N/A"
is true or not. If true ?
then we assign -1
and if false :
we keep the field as is. $ cat file
a,b,c,d,e,f
1,2,3,4,5,6
44,2,1,N/A,4,5
24,sdf,sdf,4,2,254,5
a,f,f,N/A,f,4
$ awk -F, '{ $4 = ($4 == "N/A" ? -1 : $4) } 1' OFS=, file
a,b,c,d,e,f
1,2,3,4,5,6
44,2,1,-1,4,5
24,sdf,sdf,4,2,254,5
a,f,f,-1,f,4
Here is another awk
(using example data from jaypal)
awk -F, '$4=="N/A" {$4=-1}1' OFS=, file
a,b,c,d,e,f
1,2,3,4,5,6
44,2,1,-1,4,5
24,sdf,sdf,4,2,254,5
a,f,f,-1,f,4
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