Reversing a line based on column

kylle345 · #1 (**permalink**) 11-30-2009

Hi,

I have a file that looks like this (tab seperated):

Code:

read   -  DFHJ
read1 -  IOPE
read2 + AAAB
read3 + MMMN

jim mcnamara · #2 (**permalink**) 11-30-2009

Code:

 awk 'function rev(str){ tmp=""; for(i=length(str);i>0;i--)
                                    {tmp=tmp substr(str,i,1)} 
                                 return tmp}
      {print $1, $2, ($2=="-") ? rev($3) : $3}  '  filename > newfilename

radoulov · #3 (**permalink**) 11-30-2009

With Perl:

Code:

perl -ape'
  s/(-\s*)(\w+)/$1.reverse$2/e
  ' infile

rdcwayx · #4 (**permalink**) 11-30-2009

Quote:

Originally Posted by jim mcnamara

Code:

 awk 'function rev(str){ tmp=""; for(i=length(str);i>0;i--)
                                    {tmp=tmp substr(str,i,1)} 
                                 return tmp}
      {print $1, $2, ($2=="-") ? rev($3) : $3}  '  filename > newfilename

nice function, especially this line:

tmp=tmp substr(str,i,1)

Bits Awarded / Charged to jim mcnamara for this Post
Date	User	Comment	Amount
11-30-2009	rdcwayx	nice function	100

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