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Old 01-08-2013, 10:16 AM   #1
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Insert X after every Y sequences in file


How do I insert "X" after every #Y sequences in file? I want to use sed or grep or some ubiquitous *inx software.

For example:
File =
Code:
`abcd,efg,hi ,jkl,  m`
X = (backspace and then a dollar symbol then newline)
Code:
`\b$\n`
Sequence = (anything and then a comma - but only anything once - eg. not-greedy )
Code:
`*,`
Y =
Code:
`2`
New File =
Code:
`abcd,efg$
hi ,jkl$
 m`

Thanks!
 
Old 01-08-2013, 08:15 PM   #2
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Persoanlly, I would approach this by a bash script.

This is some outline pseudo code

Code:
IFS=","
while read -a aline
  for=1 to sizeof aline; do
    if (i modulo Y not equal to zero) AND (i less than sizeof aline)
      echo -n aline[i-1]","
    elif (i equals sizeof aline)
      echo aline[i]
    else
      echo aline[i-1]"$"
    fi
  done
done << inputfile
 
  


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