On 5/2/2021 2:14 PM, Pádraig Brady wrote:
Your input data looks incorrect. There is a mixup between the letter O and digit 0. The following should be instructive: $ grep 1O5[56] f[12].txt f1.txt:1O55 f1.txt:1O56 f2.txt:1O55 f2.txt:1O56
Indeed. Sorry for the bother. I should have noticed this. Jon
