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 Documented in Volume 1 of the UNIX Programmers Manual.

 % expr $a : '.*/\(.*\)' '|' $a
  Finds the filename part (least significant part)
  of the pathname stored in the variable named 'a' which may or may not
  contain `/'.  Note the quoted shell metacharacters.

  a=\`expr $a + 1\`

  Add 1 to the shell variable named 'a'.

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