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Full Discussion: sed or awk editing help
Top Forums Shell Programming and Scripting sed or awk editing help Post 302467722 by Scrutinizer on Sunday 31st of October 2010 02:00:26 AM
Old 10-31-2010
Quote:
Originally Posted by DGPickett
this misses odd instances with adjacent spaces, since you used the opening , as a trailing , -- You must do it twice.

---------- Post updated at 05:28 PM ---------- Previous update was at 05:27 PM ----------


Also kills leading and trailing spaces, more than was requested originally, but gets past the double run need of patterns with two commas.

---------- Post updated at 05:34 PM ---------- Previous update was at 05:28 PM ----------



Does that work -- usually putting ^$ inside |(\) is NG.

You have to do it twice for ", , ,"!

None of us took care of the first or last field except your sed -r (but needs to run twice)! I would put '^' second in the (|) list, as less often true, for speed.
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/g;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.
Last edited by Scrutinizer; 10-31-2010 at 07:38 PM.. Reason: The g flag was missing from the middle (sed -r ) solution
 

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