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Shell Programming and Scripting

replace every second occurance of a string

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# 1  
Old 11-10-2011
replace every second occurance of a string
I want to replace every 2nd occurance of a string/character from a line.
Code:
ababacbsbddbsbbcbdbssb

i want to replace every s2nd b with @ like below
should be like
Code:
aba@acbs@ddbs@bc@dbss@

# 2  
Old 11-10-2011
what you tried so far ?
# 3  
Old 11-10-2011
Code:
awk '/b/{c++;if(c%2=0){sub("b","@");c=0}}1' file1 > file2

suppose the string is present in the file1 and write to file2

# 4  
Old 11-10-2011
Code:
echo "ababacbsbddbsbbcbdbssb" | nawk -Fb '{for(i=1;i<=NF;i++){if(i%2==1){printf("%sb",$i)}else{printf("%s@",$i)}}}'

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