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Full Discussion: replace last / by |
Top Forums Shell Programming and Scripting replace last / by | Post 302158444 by drl on Tuesday 15th of January 2008 10:25:47 AM
Old 01-15-2008
Hi.
Quote:
Originally Posted by reborg
Code:
sed 's_/\([^/]+\)$_|\1_'

I needed to use "*" instead of "+". Some versions of sed may need "-r" to use extended regular expressions, in which the parens also need to modified:
Code:
#!/bin/sh -

# @(#) user2    Demonstrate replacement of last specific character, sed.

sed --version | head -1

echo
echo " Original:"
echo "/home/apps/test/document" |
sed 's_/\([^/]+\)$_|\1_'

echo
echo " Modified:"
echo "/home/apps/test/document" |
sed 's_/\([^/]*\)$_|\1_'

echo
echo " Original with -r:"
echo "/home/apps/test/document" |
sed -r -e 's_/([^/]+)$_|\1_'

exit 0

Producing:
Code:
% ./user2
GNU sed version 4.1.2

 Original:
/home/apps/test/document

 Modified:
/home/apps/test|document

 Original with -r:
/home/apps/test|document

There are (too) many versions of sed, so one must know which version one is using. For example, if you were to leave the "\(", "\)" in the 3rd example, you would get an error message, "invalid reference \1", not very informative, at least not directly ... cheers, drl
 

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LEARN ABOUT SUSE

echo

ECHO(1) 							   User Commands							   ECHO(1)

NAME

       echo - display a line of text

SYNOPSIS

       echo [SHORT-OPTION]... [STRING]...
       echo LONG-OPTION

DESCRIPTION

       Echo the STRING(s) to standard output.

       -n     do not output the trailing newline

       -e     enable interpretation of backslash escapes

       -E     disable interpretation of backslash escapes (default)

       --help display this help and exit

       --version
	      output version information and exit

       If -e is in effect, the following sequences are recognized:

       NNN  the character whose ASCII code is NNN (octal)

       \     backslash

       a     alert (BEL)

            backspace

       c     produce no further output

       f     form feed

       
     new line

       
     carriage return

       	     horizontal tab

       v     vertical tab

       NOTE: your shell may have its own version of echo, which usually supersedes the version described here.	Please refer to your shell's docu-
       mentation for details about the options it supports.

AUTHOR

       Written by Brian Fox and Chet Ramey.

REPORTING BUGS

       Report echo bugs to bug-coreutils@gnu.org
       GNU coreutils home page: <http://www.gnu.org/software/coreutils/>
       General help using GNU software: <http://www.gnu.org/gethelp/>

COPYRIGHT

       Copyright (C) 2009 Free Software Foundation, Inc.  License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>.
       This is free software: you are free to change and redistribute it.  There is NO WARRANTY, to the extent permitted by law.

SEE ALSO

       The full documentation for echo is maintained as a Texinfo manual.  If the info and echo programs are properly installed at your site,  the
       command

	      info coreutils 'echo invocation'

       should give you access to the complete manual.

GNU coreutils 7.1						     July 2010								   ECHO(1)
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