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Full Discussion: Replacing patterns in a file
Top Forums Shell Programming and Scripting Replacing patterns in a file Post 302347135 by mr_manii on Tuesday 25th of August 2009 02:27:55 AM
Old 08-25-2009
Question Replacing patterns in a file

Hi Everybody,

Can we replace the contents of a file without using a temporary file.

For ex:
I need to relpace the value "old" with "new", I can do it using the sed replace pattern, but I do not want to use a temporary file.

Also, from the questions posted in the past I could see a fantastic command to do this
printf '1,$ s/old/new/g\nw! samp.txt\nq!'| ex - samp.txt

But, with the same command I am not able to replace the value of a variable
For ex: var1='new'
printf '1,$ s/new/$var1/g\nw! samp.txt\nq!'| ex - samp.txt

The above command doesn't replace the value of the variable.
 

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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 For example if commit foo has been replaced by commit bar: $ git --no-replace-objects cat-file commit foo shows information about commit foo, while: $ git cat-file commit foo shows information about commit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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