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Full Discussion: Filter ONLY lines with non-printing charaters
Top Forums Shell Programming and Scripting Filter ONLY lines with non-printing charaters Post 302987208 by Don Cragun on Wednesday 7th of December 2016 05:21:38 AM
Old 12-07-2016
You haven't really described what you consider non-printing characters. In most locales, RudiC's suggestion will select any lines that contain any character that is not <space> and is not in class alpha, not in class digit, and not in class punct (not counting the line terminating <newline> character). For many text files, you might also want to keep lines containing <tab> characters. If that is true in your case, you might try this slight modification to RudiC's suggestion:
Code:
grep '[^[:print:][:blank:]]' filename

This User Gave Thanks to Don Cragun For This Post:
JSKOBS
 

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LEARN ABOUT SUSE

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.

CONFORMING TO

       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 3.25 of the Linux man-pages project.  A description of the project, and information about reporting bugs, can
       be found at http://www.kernel.org/doc/man-pages/.

GNU
								    1999-07-25							       ISWPUNCT(3)
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