Concatenating two strings is done with the . operator:

my $concatenated = $left_field . $right_field;
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To give you more specific advice, can you please show us what code you already have and where it fails to do what you need?

Maybe perlfaq4 on arrays has some hints for a good approach.

For reading a CSV file, please use Text::CSV_XS.

$ cat test.csv
foo,bar,baz,qux
1,a,AA,Fubberwurmenslijm
2,b,BB,Keveroog
3,c,CC,Boomslanghuid

$ perl -MText::CSV_XS=csv -wE'csv(in=>csv(in=>"test.csv",bom=>1,on_in=
+>sub{$_{merged}=$_{bar}.$_{baz}}))'
qux,bar,merged,foo,baz
Fubberwurmenslijm,a,aAA,1,AA
Keveroog,b,bBB,2,BB
Boomslanghuid,c,cCC,3,CC

$ perl -MText::CSV_XS=csv -wE'csv(in=>"test.csv",bom=>1,headers=>[qw(f
+oo bar baz qux merged)],on_in=>sub{$_{merged}=$_{bar}.$_{baz}})'
foo,bar,baz,qux,merged
1,a,AA,Fubberwurmenslijm,aAA
2,b,BB,Keveroog,bBB
3,c,CC,Boomslanghuid,cCC
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"field1","field2"
could be?: ""field1""field2""
Or "field1field2"?

Use the Text::CSV_XS module to write fields which may contain quote characters. This quotes within quotes stuff can get complicated. Let the module do it. Again, A field of a CSV file is a "single thing".

update: Maybe I was not clear? Weird escaping rules can come into play when combining two text fields like "abc 123" and "xyz 456" into a single CSV field. The easiest way is "abc 123 xyz 456". However it is possible for the text field to have 2 separately identifiable quoted strings within it - that involves "quotes within quotes". If you want that, things get more complicated.

Hello pdahal,

As we do not have any sample input of data or sample of output of data, we can only provide you possible questions of other people have tried.

So having said that maybe this could help How to combine multiple files together or maybe this merging csv files into a third file preserving column & row.

One last thing to add here, a nice module Text::CSV::Merge.

Hope this helps, BR.

UPDATE: Sorry, This reply was previously posted in the wrong thread. It has been moved to the correct place.

The inevitable one liner:

perl -E 'say join ":", ( split /,/, "nose,foo,cuke,bar" )[ 0, 2 ]'

Regards, Karl

for a simply csv, without field separator inside the fields, you can try a "one liners" solution. eg.

name,surname,points
Albert,Einstein,133
Marie,Curie,145
Thomas,Edison,165
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namepoints
Albert133
Marie145
Thomas165
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The Text::CSV_XS module shown above would probably be your most-reliable solution.   To elaborate, you would read each line of data, use this module to separate the line into an array of values, then combine the strings as desired ... perhaps, into a new array.   Then, use the same module to construct a new line of CSV-formatted data from the array, which you write line-by-line to a new file.   (Perhaps, a temporary file.)   Notice that this technique purposely does not modify the original input file, allowing the program to be safely re-run while you debug it.   The module does all the dirty work (which can be tricky) of decoding and re-encoding the CSV data.   You simply concern yourself with the values.