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Full Discussion: SED: Can't Repeat Search Character in SED Output
Top Forums UNIX for Dummies Questions & Answers SED: Can't Repeat Search Character in SED Output Post 302353177 by rhetoric101 on Monday 14th of September 2009 06:09:12 PM
Old 09-14-2009
Code correction
I made a mistake when I posted my code example. I neglected to show that I wanted to replace all underscores with that same underscore followed by a zero-width space. Here is the corrected example (I added "​" in the sed loop:

<code>

#/usr/bin/sh

sed 's/>[^>]*<\//\n&/g #This isolates strings in which I'm interested by inserting newline characters.
:loop
s/\(\n>[^>]*\)_\([^>]*<\/\)/\1_​​\​\2/ #This is supposed to replace "_" with "_​​​" but it does not; instead, it stalls sed.
t loop
s/\n//g' 1.xml #This removes the newline characters

</code>

---------- Post updated at 03:09 PM ---------- Previous update was at 02:44 PM ----------

The forum wordprocessing tool has been removing my example of the zero-width space. When I try to type an ampersand followed by the pound sign and "8203;" it is rendered as a blank space by the forum editor.

Perhaps the moderator could help with the the required escape characters in this editor?

In the meantime, I'll provide an example using different characters that aren't problematic for the text editor. Here's an example where I want to replace all underscores with that same underscore followed by the letter "q":

Code:
#/usr/bin/sh
 
sed 's/>[^>]*<\//\n&/g #This isolates strings in which I'm interested by inserting newline characters.
:loop
s/\(\n>[^>]*\)_\([^>]*<\/\)/\1_Q​​\​​\2/ #This is supposed to replace "_" with "_​​​​Q" but it does not; instead, it stalls sed.
t loop
s/\n//g' 1.xml #This removes the newline characters

Here is the code for the source file (1.xml)

Code:
<MY_BIG_TAG>This_is_a_test</MY_BIG_TAG>

My desired result with this revised example using "Q" is the following:

Code:
<MY_BIG_TAG>This_Qis_Qa_Qtest</MY_BIG_TAG>

The code above works fine as long as I don't repeat the underscore in the output; in other words, if I replace the underscore with only the letter "Q" sed is able to complete.

Is there a way I can have sed repeat the underscore followed by the letter "Q"?

Thanks,

Rob
 

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LEARN ABOUT X11R4

pkgproto

pkgproto(1)							   User Commands						       pkgproto(1)

NAME

       pkgproto - generate prototype file entries for input to pkgmk command

SYNOPSIS

       pkgproto [-i] [-c class] [path1]

       pkgproto [-i] [-c class] [path1=path2...]

DESCRIPTION

       pkgproto scans the indicated paths and generates prototype(4) file entries that may be used as input to the pkgmk(1) command.

       If  no paths are specified on the command line, standard input is assumed to be a list of paths. If the pathname listed on the command line
       is a directory,	the contents of the directory is searched.  However, if input is read from stdin, a directory specified as a pathname will
       not be searched.

OPTIONS

       -i	       Ignores symbolic links and records the paths as ftype=f (a file) versus ftype=s (symbolic link).

       -c class        Maps the class of all paths to class.

OPERANDS

       path1	Pathname where objects are located.

       path2	Pathname which should be substituted on output for path1.

EXAMPLES

       Example 1: Examples of the use of pkgproto.1.

       The following two examples show uses of pkgproto and a partial listing of the output produced.

       Example 1:

       example% pkgproto /bin=bin /usr/bin=usrbin /etc=etc
       f none bin/sed=/bin/sed 0775 bin bin
       f none bin/sh=/bin/sh 0755 bin daemon
       f none bin/sort=/bin/sort 0755 bin bin
       f none usrbin/sdb=/usr/bin/sdb 0775 bin bin
       f none usrbin/shl=/usr/bin/shl 4755 bin bin
       d none etc/master.d 0755 root daemon
       f none etc/master.d/kernel=/etc/master.d/kernel 0644 root daemon
       f none etc/rc=/etc/rc 0744 root daemon

       Example 2:

       example% find / -type d -print | pkgproto
       d none / 755 root root
       d none /bin 755 bin bin
       d none /usr 755 root root
       d none /usr/bin 775 bin bin
       d none /etc 755 root root
       d none /tmp 777 root root

EXIT STATUS

       0	Successful completion.

       >0	An error occurred.

ATTRIBUTES

       See attributes(5) for descriptions of the following attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
       +-----------------------------+-----------------------------+
       |Availability		     |SUNWcsu			   |
       +-----------------------------+-----------------------------+

SEE ALSO

       pkgmk(1), pkgparam(1), pkgtrans(1), prototype(4), attributes(5)

       Application Packaging Developer's Guide

NOTES

       By  default,  pkgproto creates symbolic link entries for any symbolic link encountered (ftype=s). When you use the -i option, pkgproto cre-
       ates a file entry for symbolic links (ftype=f). The prototype(4) file would have to be edited to assign such file types as v (volatile),  e
       (editable), or x (exclusive directory). pkgproto detects linked files. If multiple files are linked together, the first path encountered is
       considered the source of the link.

       By default, pkgproto prints prototype entries on the standard output. However, the output should be saved in a  file  (named  Prototype	or
       prototype, for convenience) to be used as input to the pkgmk(1) command.

SunOS 5.10							    6 Nov 2000							       pkgproto(1)
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