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sort -k1,2andsort -k1,1 -k2,2? At least from your description, I don't understand the difference between the two commands.diff <(sort -t $'\t' -k1,2 <<<"$content") <(sort -t $'\t' -k1,2 -k2,2 <<<"$content")anddiff <(LC_ALL=C sort -t $'\t' -k1,2 <<<"$content") <(LC_ALL=C sort -t $'\t' -k1,2 -k2,2 <<<"$content")produced no output.strcoll()(the comparison function used bysort) works the same asstrcmp()there (and there only). So forsort -k1,1 -k2,2andsort -k1,2to produce different results, you need an input that contains characters that sort before the separator. In the case of TAB, that's going to be byte values 0 to 7 which are unlikely to be found in text, but you can compare on the output ofprintf 'a\1\tb\na\tc\n'.