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Full Discussion: sed and punctuations
Top Forums Shell Programming and Scripting sed and punctuations Post 302791095 by hanson44 on Monday 8th of April 2013 12:42:46 AM
Old 04-08-2013
I have some suggestions to help make it work.
Code:
1) Not needed to say \([[:punct:]]\) as [[:punct:]] is all you need.
This makes the code a little simpler to view and understand.

2) I think using a control character such as ^G is problematic. It just complicates editing and viewing files. Is it CTL-G or "^G"? Confusing. Better to stay all text-based. I use a unique mark instead.

3) Enclosing the sed script in 'single quotes' means the shell cannot "see" the variables such as ${k[$i]} so it cannot work correctly. You will have to use "double quotes" or some other method to make sure the shell can see the shell variables.

Here is an exercise that shows it is possible to remove all the punctuation, except one particular punctuation, similar to what the previous respondent posted, but I think simpler and less prone to error.
Code:
$ cat punct.txt
Bb2~`!@#$%^&*()_-+={[}]|:;"'<,>.?/

Code:
$ cat punct.sh
mark=ZZZZZZZZZZZZZZZZZZZZ

echo "Deleting punctuation, except for :"
sed "s/:/$mark/g; s/[[:punct:]]//g; s/$mark/:/g" < punct.txt

echo "Deleting punctuation, except for ;"
sed "s/;/$mark/g; s/[[:punct:]]//g; s/$mark/;/g" < punct.txt

Code:
$ ./punct.sh
Deleting punctuation, except for :
Bb2:
Deleting punctuation, except for ;
Bb2;

 

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LEARN ABOUT MINIX

iswpunct

ISWPUNCT(3)						     Linux Programmer's Manual						       ISWPUNCT(3)

NAME

       iswpunct - test for punctuation or symbolic wide character

SYNOPSIS

       #include <wctype.h>

       int iswpunct(wint_t wc);

DESCRIPTION

       The  iswpunct() function is the wide-character equivalent of the ispunct(3) function.  It tests whether wc is a wide character belonging to
       the wide-character class "punct".

       The wide-character class "punct" is a subclass of the wide-character class "graph", and therefore also a  subclass  of  the  wide-character
       class "print".

       The wide-character class "punct" is disjoint from the wide-character class "alnum" and therefore also disjoint from its subclasses "alpha",
       "upper", "lower", "digit", "xdigit".

       Being a subclass of the wide-character class "print", the wide-character class "punct" is disjoint from the wide-character class "cntrl".

       Being a subclass of the wide-character class "graph", the wide-character class "punct" is disjoint from the  wide-character  class  "space"
       and its subclass "blank".

RETURN VALUE

       The  iswpunct()	function  returns  nonzero if wc is a wide-character belonging to the wide-character class "punct".  Otherwise, it returns
       zero.

ATTRIBUTES

       For an explanation of the terms used in this section, see attributes(7).

       +-----------+---------------+----------------+
       |Interface  | Attribute	   | Value	    |
       +-----------+---------------+----------------+
       |iswpunct() | Thread safety | MT-Safe locale |
       +-----------+---------------+----------------+
CONFORMING TO

       POSIX.1-2001, POSIX.1-2008, C99.

NOTES

       The behavior of iswpunct() depends on the LC_CTYPE category of the current locale.

       This function's name is a misnomer when dealing with Unicode characters, because the wide-character class "punct" contains both punctuation
       characters and symbol (math, currency, etc.) characters.

SEE ALSO

       ispunct(3), iswctype(3)

COLOPHON

       This  page is part of release 4.15 of the Linux man-pages project.  A description of the project, information about reporting bugs, and the
       latest version of this page, can be found at https://www.kernel.org/doc/man-pages/.

GNU
								    2015-08-08							       ISWPUNCT(3)
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