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Full Discussion: Check null value in xml
Top Forums Shell Programming and Scripting Check null value in xml Post 302776701 by RudiC on Wednesday 6th of March 2013 04:54:45 PM
Old 03-06-2013
Not sure if I got all requirements correctly, but you could give this a shot:
Code:
awk     ' BEGIN         {"date +%Y%m%d%H%M%S"|getline TS; n=1}          # prepare TS variable for timestamp
         /<submit>/,                                                    # discard e.th. outside "submit" tags
         /<\/submit>/   {if ($0 ~ /<timestamp1>/)                       # if "timestamp1" tag found within "submit" tags
                           {n = sub(/<timestamp1> *<\/timestamp1>/,     # replace zero+ spaces (= empty tag value)
                                    "<timestamp1>"TS"<\/timestamp1>")}  # with TS contents; n = 0 if not empty
                         if (!n) {exit 1}                               # if n = 0, i.e. non-empty tag value, quit with error
                         print           
                        }
        '  file > resultfile || rm resultfile                           # if error, i.e. non-empty tag value, remove output
$ cat resultfile 
<submit>
<ID>16</ID>
<Reference/>
<timestamp1>20130306225424<\/timestamp1>
....
.....
</submit>

If resultfile survives, it will have the before empty tag filled with actual timestamp. Resultfile will not survive timestamps with data in them.
 

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LEARN ABOUT DEBIAN

git-lost-found

GIT-LOST-FOUND(1)						    Git Manual							 GIT-LOST-FOUND(1)

NAME

       git-lost-found - Recover lost refs that luckily have not yet been pruned

SYNOPSIS

       git lost-found

DESCRIPTION

       NOTE: this command is deprecated. Use git-fsck(1) with the option --lost-found instead.

       Finds dangling commits and tags from the object database, and creates refs to them in the .git/lost-found/ directory. Commits and tags that
       dereference to commits are stored in .git/lost-found/commit, and other objects are stored in .git/lost-found/other.

OUTPUT

       Prints to standard output the object names and one-line descriptions of any commits or tags found.

EXAMPLE

       Suppose you run git tag -f and mistype the tag to overwrite. The ref to your tag is overwritten, but until you run git prune, the tag
       itself is still there.

	   $ git lost-found
	   [1ef2b196d909eed523d4f3c9bf54b78cdd6843c6] GIT 0.99.9c
	   ...

       Also you can use gitk to browse how any tags found relate to each other.

	   $ gitk $(cd .git/lost-found/commit && echo ??*)

       After making sure you know which the object is the tag you are looking for, you can reconnect it to your regular .git/refs hierarchy.

	   $ git cat-file -t 1ef2b196
	   tag
	   $ git cat-file tag 1ef2b196
	   object fa41bbce8e38c67a218415de6cfa510c7e50032a
	   type commit
	   tag v0.99.9c
	   tagger Junio C Hamano <junkio@cox.net> 1131059594 -0800

	   GIT 0.99.9c

	   This contains the following changes from the "master" branch, since
	   ...
	   $ git update-ref refs/tags/not-lost-anymore 1ef2b196
	   $ git rev-parse not-lost-anymore
	   1ef2b196d909eed523d4f3c9bf54b78cdd6843c6

GIT

       Part of the git(1) suite

Git 1.7.10.4							    11/24/2012							 GIT-LOST-FOUND(1)
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