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Distribution: UBUNTU 5.10 since Jul-18,2006 on Intel 820 DC
I'll tell you the logic and you can write the code.
0. Define two variables H and M
1. If a line starts with the phrase "==> linuxbox" it's the host name. Store the line into variable H. Clear variable M
2. If a line starts with the phrase "mpath" it's the mpathname. Store the line in variable M.
3. If the line ends with the phrase "[faulty]", write out variable H, M and the current line.
I'd use awk but that's just 1 option.
What did you try so far? Or do you seriously expect us to do your office work for you?
Also maintain a count of the lines outputted (may be zero) and on end, write it also to the output.