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- Does it only have to have one of the letters r-t
- Are all the files only 3 characters long
- If all 3 letters are to be represented, is the order important
- If all 3 letters are to be represented, may other characters be between them
- Does the middle imply exactly, ie. 'ore' or could it be 'reverse' or are we implying simply not at the start or end
- Does 'list files' also imply that no directories or other types should be listed
As you can see, the current question is quite ambiguous
List files that has letter ' r ' to ' t ' in the middle
...so you may need to get some clarification before submitting your answer.
But if you take it to mean all files that include one or more of the letters 'r' to 't' between one or more leading and one or more trailing letters, then let's see how to do that...
Do you know how to match 'any' characters in a filename? If not, look up 'wildcard' and 'globbing'. But I'll give you a hint that '*' will match all filenames with one or more characters (not beginning with '.', ignore that for now).
You already seem to know how to express ranges of characters such as [r-t].
So think about how you would match anything followed by 'r' to 't' followed by anything.
hmm.. i think i just needto see the list of file names that has r,s,t in the middle of the file name like for example the word "ARM" we can see that the middle letter of the word is R .and also its in any length
Last edited by deidei112; 01-07-2015 at 03:38 AM.
Reason: forgot to put a explanation