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Exactly. This was what i meant by "trivial".



I don't think so. In fact, after running grep "A.E" the job would be done. The reason is that all hits this generates would differ from each other...

Yes - for that char combination/permutation. Doing so for the entire alphabet would require to run grep repeatedly, creating a new, different results file every time. An awk script might run once,...

Hi.

Off the top of my head (but before more than one cup of coffee):

1) I agree with RudiC. The OP asked for all sets.

2) I think I'd try applying the idea of a sieve as in...

Hi.

Possibly of some help:
NAME
agrep - search a file for a string or regular expression, with
approximate matching capabilities

DESCRIPTION
agrep searches the input...

Not sure I understand. Unfortunately you don't mention your OS nor your shell version. Given you're using a recent shell that has the braceexpand (-B) option, would this help:for i in A{A..Z}.; do...

Hi dtalvacchio,
Welcome to the UNIX & Linux Forum. I agree with RudiC... I'm not sure that I understand what you're trying to do. In addition to telling us what operating system and shell you're...

What exactly do you mean by that? It is obvious that "abc" and "abd" differ by one character but what about "abc" and "abcd"? What about "abbc"? And what about reversals? Are "dog" and "god"...