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Replace randomly occurrences bash

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# 8  
Old 02-20-2020
Hi
Code:
awk -F '' ' #for multiple of 3 occurrences
BEGIN   {srand(); split("a a b", ab, " ")}
        {for(i=1; i<=NF; i++)
                if($i == "a") $i = ab[int(rand()*10%3)+1]
        } 1' OFS='' file

Code:
a a a a a a a a a b
a b a a a b a a b b
the table stands at the window bnd
the picture hang on the wbll.
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LEARN ABOUT XFREE86

fnmatch

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

NAME

       fnmatch - match filename or pathname

SYNOPSIS

       #include <fnmatch.h>

       int fnmatch(const char *pattern, const char *string, int flags);

DESCRIPTION

       The fnmatch() function checks whether the string argument matches the pattern argument, which is a shell wildcard pattern.

       The flags argument modifies the behavior; it is the bitwise OR of zero or more of the following flags:

       FNM_NOESCAPE
	      If this flag is set, treat backslash as an ordinary character, instead of an escape character.

       FNM_PATHNAME
	      If  this	flag  is  set,	match  a  slash  in  string only with a slash in pattern and not by an asterisk (*) or a question mark (?)
	      metacharacter, nor by a bracket expression ([]) containing a slash.

       FNM_PERIOD
	      If this flag is set, a leading period in string has to be matched exactly by a period in pattern.  A  period  is	considered  to	be
	      leading if it is the first character in string, or if both FNM_PATHNAME is set and the period immediately follows a slash.

       FNM_FILE_NAME
	      This is a GNU synonym for FNM_PATHNAME.

       FNM_LEADING_DIR
	      If  this	flag (a GNU extension) is set, the pattern is considered to be matched if it matches an initial segment of string which is
	      followed by a slash.  This flag is mainly for the internal use of glibc and is implemented only in certain cases.

       FNM_CASEFOLD
	      If this flag (a GNU extension) is set, the pattern is matched case-insensitively.

       FNM_EXTMATCH
	      If this flag (a GNU extension) is set, extended patterns are supported, as introduced by 'ksh' and now supported	by  other  shells.
	      The extended format is as follows, with pattern-list being a '|' separated list of patterns.

       '?(pattern-list)'
	      The pattern matches if zero or one occurrences of any of the patterns in the pattern-list match the input string.

       '*(pattern-list)'
	      The pattern matches if zero or more occurrences of any of the patterns in the pattern-list match the input string.

       '+(pattern-list)'
	      The pattern matches if one or more occurrences of any of the patterns in the pattern-list match the input string.

       '@(pattern-list)'
	      The pattern matches if exactly one occurrence of any of the patterns in the pattern-list match the input string.

       '!(pattern-list)'
	      The pattern matches if the input string cannot be matched with any of the patterns in the pattern-list.

RETURN VALUE

       Zero if string matches pattern, FNM_NOMATCH if there is no match or another nonzero value if there is an error.

ATTRIBUTES

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

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

       POSIX.1-2001, POSIX.1-2008, POSIX.2.  The FNM_FILE_NAME, FNM_LEADING_DIR, and FNM_CASEFOLD flags are GNU extensions.

SEE ALSO

       sh(1), glob(3), scandir(3), wordexp(3), glob(7)

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
								    2015-12-28								FNMATCH(3)