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Full Discussion: sed Character match and replace
Top Forums Shell Programming and Scripting sed Character match and replace Post 302839597 by adisky123 on Friday 2nd of August 2013 04:46:55 AM
Old 08-02-2013
sed Character match and replace
Hello All

I am struck in the issue which I want to share with all of you.
What I am trying to do is For every line in a file I have to replace a particular character from the given character in a file
For Example

Suppose the data is
Code:
1111x2222
1111x2222
2222y3333
1111x2222

I will pass three argument to shell script
./script 5 x y
It mean for Evey 5th character in line if it found x it should replace by y and if it found y it should replace with x

So output should be
Code:
1111y2222
1111y2222
2222x3333
1111y2222

---------- Post updated at 03:46 AM ---------- Previous update was at 03:45 AM ----------

So far what I wrote in shell script is
Code:
pos=$1
ppos=`expr $pos - 1`
pat1=$2
pat2=$3

sed "/^.\{$ppos\}$pat1/s/./$pat2/$pos" mdat

But it is doing at one way
 

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LEARN ABOUT DEBIAN

git-replace

GIT-REPLACE(1)							    Git Manual							    GIT-REPLACE(1)

NAME

       git-replace - Create, list, delete refs to replace objects

SYNOPSIS

       git replace [-f] <object> <replacement>
       git replace -d <object>...
       git replace -l [<pattern>]

DESCRIPTION

       Adds a replace reference in .git/refs/replace/

       The name of the replace reference is the SHA1 of the object that is replaced. The content of the replace reference is the SHA1 of the
       replacement object.

       Unless -f is given, the replace reference must not yet exist in .git/refs/replace/ directory.

       Replacement references will be used by default by all git commands except those doing reachability traversal (prune, pack transfer and
       fsck).

       It is possible to disable use of replacement references for any command using the --no-replace-objects option just after git.

       For example if commit foo has been replaced by commit bar:

	   $ git --no-replace-objects cat-file commit foo

       shows information about commit foo, while:

	   $ git cat-file commit foo

       shows information about commit bar.

       The GIT_NO_REPLACE_OBJECTS environment variable can be set to achieve the same effect as the --no-replace-objects option.

OPTIONS

       -f
	   If an existing replace ref for the same object exists, it will be overwritten (instead of failing).

       -d
	   Delete existing replace refs for the given objects.

       -l <pattern>
	   List replace refs for objects that match the given pattern (or all if no pattern is given). Typing "git replace" without arguments,
	   also lists all replace refs.

BUGS

       Comparing blobs or trees that have been replaced with those that replace them will not work properly. And using git reset --hard to go back
       to a replaced commit will move the branch to the replacement commit instead of the replaced commit.

       There may be other problems when using git rev-list related to pending objects. And of course things may break if an object of one type is
       replaced by an object of another type (for example a blob replaced by a commit).

SEE ALSO

       git-tag(1) git-branch(1) git(1)

GIT

       Part of the git(1) suite

Git 1.7.10.4							    11/24/2012							    GIT-REPLACE(1)
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