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Full Discussion: Strange Sed !!
Top Forums Shell Programming and Scripting Strange Sed !! Post 302690681 by pamu on Thursday 23rd of August 2012 08:55:04 AM
Old 08-23-2012
Quote:
Originally Posted by vidyadhar85
Code:
 
wload/lscp/home/lscpvbf > v=1/1/1/
wload/lscp/home/lscpvbf > v=`echo $v|sed -e "s/\//\\\//g"`;echo $v
1/1/1/
wload/lscp/home/lscpvbf > v=1/1/1/
wload/lscp/home/lscpvbf > v=`echo $v|sed -e 's/\//\\\//g'`;echo $v
sed: Function s/\//\\//g cannot be parsed.
wload/lscp/home/lscpvbf > v=1/1/1/
wload/lscp/home/lscpvbf > v=`echo $v|sed -e 's?\/?\\\/?g'`;echo $v
1\/1\/1\/
wload/lscp/home/lscpvbf > uname -a
AIX tide2e16 3 5 00C7810F4C00
wload/lscp/home/lscpvbf >

Can some one please let me know the reason behind this strange behaviour of SED?
One extra backslash is there in your script....

see below output..

Code:
$ v=1/1/1/
$ echo "$v" | sed 's/\//\\/g'
1\1\1\

 

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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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