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 Commands for `sed' gurus
 ========================
 
    In most cases, use of these commands indicates that you are probably
 better off programming in something like `awk' or Perl.  But
 occasionally one is committed to sticking with `sed', and these
 commands can enable one to write quite convoluted scripts.
 
 `: LABEL'
      [No addresses allowed.]
 
      Specify the location of LABEL for branch commands.  In all other
      respects, a no-op.
 
 `b LABEL'
      Unconditionally branch to LABEL.  The LABEL may be omitted, in
      which case the next cycle is started.
 
 `t LABEL'
      Branch to LABEL only if there has been a successful `s'ubstitution
      since the last input line was read or conditional branch was taken.
      The LABEL may be omitted, in which case the next cycle is started.
 
 

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