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Editorial Team
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Asked: 2026-05-28T06:22:53+00:00

I have two variables which are comma separated lists. I would like to join

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I have two variables which are comma separated lists. I would like to join these two variables by appending the lines based on their unique id.

Example below:

var1="
id1,data1,data2,data3
id2,data1,data2,data3
id3,data1,data2,data3
id4,data1,data2,data3
"

var 2="
id1,data4,data5,data6
id2,data4,data5,data6
id3,data4,data5,data6
id4,data4,data5,data6
"

output="
id1,data1,data2,data3,data4,data5,data6
id2,data1,data2,data3,data4,data5,data6
id3,data1,data2,data3,data4,data5,data6
id4,data1,data2,data3,data4,data5,data6
"

I’m not the best at AWK and while I can decrypt it I still have troubles coming up with commands. If you could help that would be great!

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1 Answer

  1. Editorial Team

    If you’re not set on sed or awk, you can use join:

    $ cat in1
id1,data1,data2,data3
id2,data1,data2,data3
id3,data1,data2,data3
id4,data1,data2,data3
x
$ cat in2
id1,data4,data5,data6
id2,data4,data5,data6
id3,data4,data5,data6
id4,data4,data5,data6
y
$ join -t, -j1 in1 in2
id1,data1,data2,data3,data4,data5,data6
id2,data1,data2,data3,data4,data5,data6
id3,data1,data2,data3,data4,data5,data6
id4,data1,data2,data3,data4,data5,data6
$ join -t, -a1 -a2 -j1 in1 in2
id1,data1,data2,data3,data4,data5,data6
id2,data1,data2,data3,data4,data5,data6
id3,data1,data2,data3,data4,data5,data6
id4,data1,data2,data3,data4,data5,data6
x
y

    Use the -a1 -a2 options if you want to see unmatched lines, otherwise don’t.

    Note that the files need to be sorted, if they’re not already, you can use the sort command for that.

    sort in1 > in1.sorted
sort in2 > in2.sorted
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