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Full Discussion: Swapping or switching 2 lines using sed
Top Forums Shell Programming and Scripting Swapping or switching 2 lines using sed Post 302247117 by summer_cherry on Wednesday 15th of October 2008 03:07:22 AM
Old 10-15-2008
hi

I think below perl script can help you a little.

Code:
$file=shift;
$l1=shift;
$l2=shift;
open FH,"<$file";
while(<FH>){
	$arr[$.]=$_;
}
close FH;
for($i=1;$i<=$#arr;$i++){
	if($i==$l1){
		print $arr[$l2];
	}
	else{
		if ($i==$l2){
			print $arr[$l1];
		}
		else{
			print $arr[$i];
		}
	}
}


Below sed script can not adress your question flexbily, but should throw some light on that.
Code:
1
2
5
4
3
6

Code:
1
2
3
4
5
6

Code:
sed -n '/5/ !{
p
}
/5/ {
h
n
G
x
n
G
p
}'

Last edited by summer_cherry; 10-15-2008 at 04:19 AM..
 

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LEARN ABOUT PHP

shift

shift(1)                                                           User Commands                                                          shift(1)

NAME

       shift - shell built-in function to traverse either a shell's argument list or a list of field-separated words

SYNOPSIS

   sh
       shift [n]

   csh
       shift [variable]

   ksh
       * shift [n]

DESCRIPTION

   sh
       The positional parameters from $n+1 ... are renamed $1 ... . If n is not given, it is assumed to be 1.

   csh
       The  components of argv, or variable, if supplied, are shifted to the left, discarding the first component. It is an error for the variable
       not to be set or to have a null value.

   ksh
       The positional parameters from $n+1 $n+1 ... are renamed $1 ..., default n is 1. The parameter n can  be  any  arithmetic  expression  that
       evaluates to a non-negative number less than or equal to $#.

       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,  following 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 word splitting and file name generation  are  not
           performed.

ATTRIBUTES

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

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

SEE ALSO

       csh(1), ksh(1), sh(1), attributes(5)

SunOS 5.10                                                          15 Apr 1994                                                           shift(1)
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