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Full Discussion: Eliminate Hyphenated Words in Grep
Top Forums UNIX for Dummies Questions & Answers Eliminate Hyphenated Words in Grep Post 302685973 by bakunin on Monday 13th of August 2012 07:09:12 PM
Old 08-13-2012
Quote:
Originally Posted by sudon't
I can't figure this out, and surprisingly, I couldn't come up with anything online.[...] No doubt I am missing something obvious and simple.
Actually this is as baffling for you as it is for me. I haven't noticed this behavior before. The GNU-sed i have at hand actually gets it right (see below).

What you can do is to "invert" the action tied to the regexp in question, for instance, using the following input file (no trailing blanks):

Code:
1 -
2
3
4
5
6 -
7
8
9
10

Code:
$ sed -n '/[-]/p' /path/to/input
1 -
6 -

would print all lines with hyphens in it. Instead of the non-working

Code:
sed -n '/[^-]/p' /path/to/input

one could use

Code:
$ sed -n '/[-]/!p' /path/to/input
2
3
4
5
7
8
9
10

which works as expected. I am aware that this is a work-around instead of a solution, but the best i can come up right now. Actually my sed got the regexp in question correct:

Code:
$ sed -n '/[^-]$/p' /path/to/input
2
3
4
5
7
8
9
10

I was first tricked by the regexp above, but it only searches for any non-hyphen and this condition is met by any line, even the ones with hyphens in them because they also have non-hyphens. When i anchored the non-hyphen to the end, i got the correct and expected result.

I hope this helps.

bakunin
Last edited by bakunin; 08-13-2012 at 08:27 PM..
 

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LEARN ABOUT PLAN9

split

SPLIT(1)						      General Commands Manual							  SPLIT(1)

NAME

       split - split a file into pieces

SYNOPSIS

       split [ option ...  ] [ file ]

DESCRIPTION

       Split reads file (standard input by default) and writes it in pieces of 1000 lines per output file.  The names of the output files are xaa,
       xab, and so on to xzz.  The options are

       -n     Split into n-line pieces.

       -e expression
	      File divisions occur at each line that matches a regular expression; see regexp(6).  Multiple -e options may appear.   If  a  subex-
	      pression	of  expression is contained in parentheses (...), the output file name is the portion of the line which matches the subex-
	      pression.

       -f stem
	      Use stem instead of x in output file names.

       -s suffix
	      Append suffix to names identified under -e.

       -x     Exclude the matched input line from the output file.

       -i     Ignore case in option -e; force output file names (excluding the suffix) to lower case.

SOURCE

       /sys/src/cmd/split.c

SEE ALSO

       sed(1), awk(1) grep(1), regexp(6)

																	  SPLIT(1)
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