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problem with counter

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linux-howto

http://www.unix.com – i having a file Code: xxxxxxxxxxxxxxx1234  ...........value can be  change xxxxxxxxxxxxxxx1235 xxxxxxxxxxxxxxxx1236 . . . . xxxxxxxxxxxxxxxxx1300 ...........value can be  change i want to cut last four characters of first line and last line and find the missing pattern. output should be like this Code: missing pattern are  1240.1242.1289  ("." is sequence separator) (HowTos)