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Top Forums Shell Programming and Scripting Combine multiple lines in single line Post 302466441 by The One on Tuesday 26th of October 2010 11:24:00 AM
Old 10-26-2010
Quote:
Originally Posted by DGPickett
Code:
sed '
  :loop
  $b
  N
  /: .*\n.*: /{
    P
    s/.*\n//
    b loop
   }
  s/ *\n */ /
  b loop
 '

Narrative: This is what I call a sed looper, reading it's own lies after the first rather than exiting the script at the end to get the next line:
  1. declare a branch target 'loop',
  2. if last line, print and exit,
  3. If the two lines in the buffer each have ': ', print out the first line and go back to 'loop' to get another line.
  4. Remove the linefeed and any adjacent spaces in favor of a single space.
  5. Go back to 'loop' to get another line.
you really are a genius! I wanted to learn more in this as im using this kind of text editing frequently. Do you know any reference on this kind of sed function where i can learn more?
 

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break(1)                                                           User Commands                                                          break(1)

NAME
break, continue - shell built-in functions to escape from or advance within a controlling while, for, foreach, or until loop SYNOPSIS
sh break [n] continue [n] csh break continue ksh *break [n] *continue [n] DESCRIPTION
sh The break utility exits from the enclosing for or while loop, if any. If n is specified, break n levels. The continue utility resumes the next iteration of the enclosing for or while loop. If n is specified, resume at the n-th enclosing loop. csh The break utility resumes execution after the end of the nearest enclosing foreach or while loop. The remaining commands on the current line are executed. This allows multilevel breaks to be written as a list of break commands, all on one line. The continue utility continues execution of the next iteration of the nearest enclosing while or foreach loop. ksh The break utility exits from the enclosed for, while, until, or select loop, if any. If n is specified, then break n levels. If n is greater than the number of enclosing loops, the outermost enclosing loop shall be exited. The continue utility resumes the next iteration of the enclosed for, while, until, or select loop. If n is specified then resume at the n- th enclosed loop. If n is greater than the number of enclosing loops, the outermost enclosing loop shall be used. On this man page, ksh(1) commands that are preceded by one or two * (asterisks) are treated specially in the following ways: 1. Variable assignment lists preceding the command remain in effect when the command completes. 2. I/O redirections are processed after variable assignments. 3. Errors cause a script that contains them to abort. 4. Words that follow a command preceded by ** that are in the format of a variable assignment are expanded with the same rules as a vari- able assignment. This means that tilde substitution is performed after the = sign, and also that word splitting and file name genera- tion are not performed. ATTRIBUTES
See attributes(5) for descriptions of the following attributes: +-----------------------------+-----------------------------+ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | +-----------------------------+-----------------------------+ |Availability |SUNWcsu | +-----------------------------+-----------------------------+ SEE ALSO
csh(1), exit(1), ksh(1), sh( 1), attributes(5) SunOS 5.10 17 Jul 2002 break(1)
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