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Full Discussion: sed or awk editing help
Top Forums Shell Programming and Scripting sed or awk editing help Post 302467663 by DGPickett on Saturday 30th of October 2010 05:34:29 PM
Old 10-30-2010
Quote:
Originally Posted by ygemici
additional If you have spaces and also tabs you can use Smilie
Code:
# sed 's/,[[:space:]]*,/,,/g' infile

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 ----------

Quote:
Originally Posted by ctsgnb
Code:
sed 's: *, *:,:g' infile

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 ----------

Quote:
Originally Posted by Scrutinizer
This takes out space-only fields at the beginning and end as well, while leaving all other spaces intact.
Code:
sed 's/\(^\|,\) *\(,\|$\)/\1\2/g'

GNU sed -r :
Code:
sed -r 's/(^|,) *(,|$)/\1\2/g'

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.
 

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