bash - checking that the rows in a file have the same number of columns -

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i have number of tsv files, , want check each file correctly formatted. primarily, want check each row has right number of columns. there way this? i'd love command line solution if there one. 

awk '{print nf}' test | sort -nu | head -n 1

this gives lowest number of columns in file on given row.

awk '{print nf}' test | sort -nu | tail -n 1

this gives highest number of columns in file on given row. result should same, if columns present.

note: gives me error on os x, not on debian... maybe use gawk.


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