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find and replace - multiple combinations

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# 1  
Old 11-14-2016
find and replace - multiple combinations
Hello all,

I'm trying to replace all possible combinations of specific character occurrences within a string with another character, that is:

For the following string:
Code:
ABCAACD

I want to replace all the possible combinations of the character 'A' with the character 'G', so the output should be:
Code:
GBCAACD
GBCGACD
GBCGGCD
ABCGACD
ABCGGCD
ABCAGCD

Does anyone know if there is a linux command that can do it?

Thanks a lot for any help!
Last edited by rbatte1; 11-14-2016 at 12:19 PM.. Reason: Added CODE tags
# 2  
Old 11-14-2016
How about
Code:
awk '
        {for (i=1; i<=NF; i++)   if ($i == "A") AC[++C] = i
         for (i=1; i<=C; i++)   {SAV = $0
                                 for (j=i; j<=C; j++)   {$AC[j] = "G"
                                                         print
                                                        }
                                 $0 = SAV
                                }
        }
' FS= OFS= file
GBCAACD
GBCGACD
GBCGGCD
ABCGACD
ABCGGCD
ABCAGCD

# 3  
Old 11-14-2016
Hi,
Or with sed:
Code:
$ echo ABCAACD | sed  'h;:bcl;s/A/_/;H;tbcl;g;s/\(.*\)\n.*\n.*/\1/' | sed -n ':deb;s/A/G/p;tdeb' | sed 's/_/A/g'
GBCAACD
GBCGACD
GBCGGCD
ABCGACD
ABCGGCD
ABCAGCD

Regards.
# 4  
Old 11-14-2016
Quote:
Originally Posted by hagit
Hello all,

I'm trying to replace all possible combinations of specific character occurrences within a string with another character, that is:

For the following string:
Code:
ABCAACD

I want to replace all the possible combinations of the character 'A' with the character 'G', so the output should be:
Code:
GBCAACD
GBCGACD
GBCGGCD
ABCGACD
ABCGGCD
ABCAGCD

Does anyone know if there is a linux command that can do it?

Thanks a lot for any help!
If you want all combinations, why isn't GBCAGCD included in the desired output?

You haven't said what operating system you're using, and some of the suggestions you have received so far will do what was requested on Linux systems, but not on most BSD and UNIX systems.

If you do want all combinations, you might try something more like:
Code:
printf '%s\n' ABCAACD A AA AAAA | awk -FA '
{	printf("Input:\t%s\n", $0)
	for(i = 1; i < 2 ^ (NF - 1); i++) {
		x = i
		for(j = 1; j < NF; j++) {
			printf("%s%s", $j, (x % 2) ? "G" : "A")
			x = int(x / 2)
		}
		printf("%s%s", $NF, ORS)
	}
}'

which produces the output:
Code:
Input:	ABCAACD
GBCAACD
ABCGACD
GBCGACD
ABCAGCD
GBCAGCD
ABCGGCD
GBCGGCD
Input:	A
G
Input:	AA
GA
AG
GG
Input:	AAAA
GAAA
AGAA
GGAA
AAGA
GAGA
AGGA
GGGA
AAAG
GAAG
AGAG
GGAG
AAGG
GAGG
AGGG
GGGG

If you want to try this on a Solaris/SunOS system, change awk to /usr/xpg4/bin/awk or nawk.
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