Hi, Thank you for your quick response. By all rows need to be filled, I meant that the same logic needs to be used to fill up all the rows. The top level algo will be: 1. Calculate number of columns from the header. 2. Start splitting the last row in the file by the number of columns. 3. Paste the splits starting from the second row. I tried the script and it is not giving the desired output. Input: 
  
    a       b    c    d    e    f    g    h
aa
bb
cc
dd
aa
bb
cc
dd
aa
bb
cc
dd
1    2    3    4    5    6    7    8    9    10    11    12    13    1
4    15    16

[download]
Output with your script snippet: 
 

    a    b    c    d    e    f    g    h
aa    4    15    16
bb
cc
dd
aa
bb
cc
dd
aa
bb
cc
dd
1    2    3    4    5    6    7    8    9    10    11    12    13    1

[download]
Desired: 
 

    a       b    c    d    e    f    g    h
aa 1        2    3    4    5    6    7    8
bb 9       10    11   12   13   14   15   16
cc 17      18     19  20   21   22   23   24 
dd 25      26     27  28   29   30   31   32 
aa 33      34     35  36   37   38   39   40
bb  41     42     43  44   45   46   47   48
cc  49     50     51  52   53   54   55   56
dd  57     58     59  60   61   62   63   64
aa  65     66     67  68   69   70   71   72
bb  73     74     75  76   77   78   79   80
cc  81     82     83  84   85   86   87   88
dd  89     90     91  92   93   94   95   96
1    2    3    4    5    6    7    8    9    10    11    12    13    1
+4    15    16    17    18    19    20    21    22    23    24    25  
+  26    27    28    29    30    31    32    33    34    35    36    3
+7    38    39    40    41    42    43    44    45    46    47    48  
+  49    50    51    52    53    54    55    56    57    58    59    6
+0    61    62    63    64    65    66    67    68    69    70    71  
+  72    73    74    75    76    77    78    79    80    81    82    8
+3    84    85    86    87    88    89    90    91    92    93    94  
+  95    96

[download]

In reply to Re^2: Cutting text from the end of the file and adding it to the top by oysterperl
in thread Cutting text from the end of the file and adding it to the top by oysterperl

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