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Full Discussion: Replace null values with dot using awk
Top Forums Shell Programming and Scripting Replace null values with dot using awk Post 302979679 by Don Cragun on Wednesday 17th of August 2016 02:43:19 PM
Old 08-17-2016
Quote:
Originally Posted by rdrtx1
Code:
sed 's/^ *\t/.\t/; s/\t *\t/\t.\t/g; s/\t$/\t./' input

That will work as long as:
  1. you never have two adjacent fields only containing zero or more <space> characters (other than in a line only containing one <tab>),
  2. you never have only one or more <space> characters in the last field on an input line,
  3. you are using a version of sed that allows you to separate substitute commands with a <semicolon> character,
  4. you are using a version of the sed utility that recognizes \t in an RE as a <tab> character, and
  5. you are using a version of the sed utility that recognizes \t in a replacement string as a <tab> character
(all of the last three of which produce behavior that is not specified the standards).

The first problem can be fixed by repeating the 2nd substitute command:
Code:
sed 's/^ *\t/.\t/; s/\t *\t/\t.\t/g; s/\t *\t/\t.\t/g; s/\t$/\t./' input

The second problem can be fixed by adding a * to the RE in the last substitute command:
Code:
sed 's/^ *\t/.\t/; s/\t *\t/\t.\t/g; s/\t *\t/\t.\t/g; s/\t *$/\t./' input

The third problem can be fixed by replacing the <semicolon> characters with <newline> characters:
Code:
sed 's/^ *\t/.\t/
 s/\t *\t/\t.\t/g
 s/\t *\t/\t.\t/g
 s/\t *$/\t./' input

And the last two problems can be fixed by replacing every occurrence of \t in the above sed command with a literal <tab> character.
 

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