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Top Forums Shell Programming and Scripting Breaking long lines into (characters, newline, space) groups Post 302316209 by rowie718 on Thursday 14th of May 2009 10:58:47 AM
Old 05-14-2009
Breaking long lines into (characters, newline, space) groups

Hello,

I am currently trying to edit an ldif file. The ldif specification states that a newline followed by a space indicates the subsequent line is a continuation of the line. So, in order to search and replace properly and edit the file, I open the file in textwrangler, search for "\r " and remove it, thus making all continued lines into single lines. Thats the first step. I make my changes to the ldif file at that point.

Now, after editing, I want to break any lines with more than 79 characters, (some of which are hundreds of characters long) into this: 79 characters, newline, space, next 79 characters, newline, space, next 79 characters, newline, space, etc.

using this simple sed command:

Code:
sed 's/./\
 /80' myfile > newfile

works for the first 79 characters of line x, breaks it properly, but then moves on to the next line in the ldif, leaving line x broken into: 79 characters, newline, space, remaining chunk of line x which is hundreds of characters, next line in ldif. Only partial success!

So heres the question. Is there a way to use sed to run this command every 79th character until the end of the line? If not, alternately, should I use a loop in the script using some sort of conditional statement like, if there are lines longer than 79 characters, rerun the sed command. (so that it will go and now break the remaining hundreds of characters that were not broken in the original sed run. and continue looping till all lines are broken into (79 character, newline, space) chunks? How could I set up that condition? I dont know how to search for lines longer than x characters.

Thanks a lot for any help on this!
 

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PASTE(1)						    BSD General Commands Manual 						  PASTE(1)

NAME
paste -- merge corresponding or subsequent lines of files SYNOPSIS
paste [-s] [-d list] file ... DESCRIPTION
The paste utility concatenates the corresponding lines of the given input files, replacing all but the last file's newline characters with a single tab character, and writes the resulting lines to standard output. If end-of-file is reached on an input file while other input files still contain data, the file is treated as if it were an endless source of empty lines. The options are as follows: -d list Use one or more of the provided characters to replace the newline characters instead of the default tab. The characters in list are used circularly, i.e., when list is exhausted the first character from list is reused. This continues until a line from the last input file (in default operation) or the last line in each file (using the -s option) is displayed, at which time paste begins selecting characters from the beginning of list again. The following special characters can also be used in list: newline character tab character \ backslash character Empty string (not a null character). Any other character preceded by a backslash is equivalent to the character itself. -s Concatenate all of the lines of each separate input file in command line order. The newline character of every line except the last line in each input file is replaced with the tab character, unless otherwise specified by the -d option. If '-' is specified for one or more of the input files, the standard input is used; standard input is read one line at a time, circularly, for each instance of '-'. EXIT STATUS
The paste utility exits 0 on success, and >0 if an error occurs. EXAMPLES
List the files in the current directory in three columns: ls | paste - - - Combine pairs of lines from a file into single lines: paste -s -d ' ' myfile Number the lines in a file, similar to nl(1): sed = myfile | paste -s -d ' ' - - Create a colon-separated list of directories named bin, suitable for use in the PATH environment variable: find / -name bin -type d | paste -s -d : - SEE ALSO
cut(1), lam(1) STANDARDS
The paste utility is expected to be IEEE Std 1003.2 (``POSIX.2'') compatible. HISTORY
A paste command appeared in Version 32V AT&T UNIX. BSD
June 25, 2004 BSD
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