Question

I have a few comma delmited files in a folder. The lines look like this…

1,2,3,4,5
6,7,8
9,10
11,12,13,14,15

All the files are expected to have exact 5 columns. But there are a few files where one or all the lines are less than 5 as shown above.
How do I know the names of such files?

If all the lines have exactly 4 comma then there is no issue and such files are considered OK.

Answer 1

does this line (find + awk) work for you?

 find . -name *.txt |xargs -I{} awk -F',' 'NF!=5{print FILENAME;exit;}' {}

assume that your files have extension “txt”

update

OP wants the line numbers:

kent$  head *.txt
==> 4.txt <==
1,2,3,4,5
6,7,8
9,10
11,12,13,14,15

==> one.txt <==
1,2,3,4,5
6,7,8
9,10
11,12,13,14,15

==> three.txt <==
11,12,13,14,15

==> two.txt <==
11,12,13,14,15

kent$  find . -name *.txt |xargs -I{} awk -F',' 'NF!=5{print FILENAME,NR}' {}
./one.txt 2
./one.txt 3
./4.txt 2
./4.txt 3

update again

OP, you should describe your question more clearly.

so you want the total line numbers (the sum):

kent$  find . -name *.txt |xargs -I{} awk -F',' 'NF!=5{a[FILENAME]++;} END{if(a[FILENAME]) print FILENAME, a[FILENAME]}' {}
./one.txt 2
./4.txt 2