sed or awk editing help Post: 302467773

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Top Forums Shell Programming and Scripting sed or awk editing help Post 302467773 by ygemici on Sunday 31st of October 2010 07:06:13 AM

10-31-2010

Registered User

Quote:

Originally Posted by Scrutinizer

Hi, I found out this works by trying it out. Good point about the ^ in the second part and especially the ,,, or more situation. I hadn't thought of that... Smilie

. I also realized that looking for ␠* is less efficient than ␠␠*. So I think the best option is to run twice, not by piping , but by using a loop and leaving the g flag in (out is less efficient):

Code:

sed ':a;s/\(,\|^\)  *\(,\|$\)/\1\2/g;ta'

or GNU sed.

Code:

sed -r ':a;s/(,|^)  *(,|$)/\1\2/;ta'

or some older seds:

Code:

sed -e ':a' -e 's/\(,\|^\)  *\(,\|$\)/\1\2/g;ta'

of course every space can be replaced by [ \t] if the need arises.

I am sorry but I dont agree some ideas with you and DGPickett
whats happening there?

I say if there is even other chars (expect null character ) in between pattern match then there is no diffrerent use twice in this example.
because we search spaces or tabs in between two commas..

Code:

[root@rhnserver ~]# cat file1
 
 ,1234,
,123344,
1
, ,
,  ,
,BBB,
,BBB ,
, BBB ,
,  BBB  ,

Code:

[root@rhnserver ~]# sed 's/,[0-9]*,/CHANGE/g' file1
 
CHANGE
CHANGE
1
, ,
, ,
,BBB,
,BBB ,
, BBB ,
, BBB ,

Code:

[root@rhnserver ~]# sed 's/,[0-9][0-9]*,/CHANGE/g' file1
 
CHANGE
CHANGE
1
, ,
, ,
,BBB,
,BBB ,
, BBB ,
, BBB ,

well, when we search single pattern or probably if there are matched unwanted strings for ex contain just numbers then get wrong results

Code:

[root@rhnserver ~]# cat file1
 
 
,1234,
,123344,
1
, ,
,  ,
,BBB,
,BBB ,
, BBB ,
,  BBB  ,

Code:

[root@rhnserver ~]# sed 's/[0-9][0-9]*/CHANGE/g' file1
 
 ,CHANGE,
,CHANGE,
CHANGE
,,
, ,
,  ,
,BBB,
,BBB ,
, BBB ,
,  BBB  ,

Code:

[root@rhnserver ~]# sed 's/[0-9]*/CHANGE/g' file1  --> wrong we must use twice for correct results
CHANGE
CHANGE CHANGE,CHANGE,CHANGE CHANGE
CHANGE,CHANGE,CHANGE
CHANGE
CHANGE,CHANGE,CHANGE
CHANGE,CHANGE CHANGE,CHANGE
CHANGE,CHANGE CHANGE CHANGE,CHANGE
CHANGE,CHANGEBCHANGEBCHANGEBCHANGE,CHANGE
CHANGE,CHANGEBCHANGEBCHANGEBCHANGE CHANGE,CHANGE
CHANGE,CHANGE CHANGEBCHANGEBCHANGEBCHANGE CHANGE,CHANGE
CHANGE,CHANGE CHANGE CHANGEBCHANGEBCHANGEBCHANGE CHANGE CHANGE,CHANGE
CHANGE

Code:

[root@rhnserver ~]# sed 's/,[0-9][0-9]*/CHANGE/g' file1
 
 CHANGE,
CHANGE,
1
,,
, ,
,  ,
,BBB,
,BBB ,
, BBB ,
,  BBB  ,

Code:

[root@rhnserver ~]# sed 's/,[0-9]*/CHANGE/g' file1
 CHANGECHANGE
CHANGECHANGE
1
CHANGECHANGE
CHANGE CHANGE
CHANGE  CHANGE
CHANGEBBBCHANGE
CHANGEBBB CHANGE
CHANGE BBB CHANGE
CHANGE  BBB  CHANGE

or

one difference state because matched string + null + string
and we dont want this

Code:

[root@rhnserver ~]# cat file1
 
 ,1234,
,123344,
1
,,   ----> we dont this
, ,
,  ,
,BBB,
,BBB ,
, BBB ,
,  BBB  ,

Code:

[root@rhnserver ~]# sed 's/,[0-9]*,/CHANGE/g' file1
 
 CHANGE
CHANGE
1
CHANGE  --> change
, ,
,  ,
,BBB,
,BBB ,
, BBB ,
,  BBB  ,

Code:

[root@rhnserver ~]# sed 's/,[0-9][0-9]*,/CHANGE/g' file1
 
 CHANGE
CHANGE
1
,,  --> no change
, ,
,  ,
,BBB,
,BBB ,
, BBB ,
,  BBB  ,

regards
ygemici

ygemici

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