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assume I have a string
"1,2,3,4"
Now I want to replace, e.g. the 3rd field of the string by some different value.
"1,2,NEW,4"
I managed to do this with the following command:
echo "1,2,3,4" | awk -F, -v OFS=, '{$3="NEW"; print }'
Now the index for the column to be replaced should be passed as a variable. So in this case
index=3
How can I pass this to awk? Because this won't work:
echo "1,2,3,4" | awk -F, -v OFS=, '{$index="NEW"; print }'
echo "1,2,3,4" | awk -F, -v OFS=, '{$($index)="NEW"; print }'
echo "1,2,3,4" | awk -F, -v OFS=, '{\$$index="NEW"; print }'
Thanks for your help!
881
awk has two functions; sub and gsub that we can use to perform substitutions. sub and gsub are mostly identical for the most part, but sub will only replace the first occurrence of a string. On the other hand, gsub will replace all occurrences.
Combining the Twoawk and sed are both incredibly powerful when combined. You can do this by using Unix pipes.
This might work for you:
index=3
echo "1,2,3,4" | awk -F, -v OFS=, -v INDEX=$index '{$INDEX="NEW"; print }'
or:
index=3
echo "1,2,3,4" | sed 's/[^,]*/NEW/'$index
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