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Full Discussion: Adding text to file on certain lines with(special characters)
Top Forums Shell Programming and Scripting Adding text to file on certain lines with(special characters) Post 302380864 by durden_tyler on Wednesday 16th of December 2009 11:37:04 AM
Old 12-16-2009
Try this:

Code:
$
$ cat change_status.pl
#!/usr/bin/perl

$file = "status";
$RM2 = "BLAH";

open($fh, "<", $file) or die "Could not open $file: $!\n";
@list = <$fh>;
close($fh);

$list[30] = "RM=\"rm2\"\n";                   # this will affect line 31
$list[37] =~ s/"$/ $RM2"/;                    # this will affect line 38
$list[42] = "rm2DESC=\"Result Manager2\"\n";  # this will affect line 43

open($fh, ">", $file) or die "Could not open $file: $!\n";
print $fh @list;
close($fh);
$
$

Testcase below:

Code:
$ 
$ cat -n status
     1  This is line 1
     2  This is line 2
     3  This is line 3
     4  This is line 4
     5  This is line 5
     6  This is line 6
     7  This is line 7
     8  This is line 8
     9  This is line 9
    10  This is line 10
    11  This is line 11
    12  This is line 12
    13  This is line 13
    14  This is line 14
    15  This is line 15
    16  This is line 16
    17  This is line 17
    18  This is line 18
    19  This is line 19
    20  This is line 20
    21  This is line 21
    22  This is line 22
    23  This is line 23
    24  This is line 24
    25  This is line 25
    26  This is line 26
    27  This is line 27
    28  This is line 28
    29  This is line 29
    30  This is line 30
    31  This is line 31
    32  This is line 32
    33  This is line 33
    34  This is line 34
    35  This is line 35
    36  This is line 36
    37  This is line 37
    38  Yadda="$RWHOIS $LM $RM"
    39  This is line 39        
    40  This is line 40        
    41  This is line 41        
    42  This is line 42        
    43  This is line 43        
    44  This is line 44        
    45  This is line 45        
    46  This is line 46        
    47  This is line 47        
    48  This is line 48        
    49  This is line 49        
    50  This is line 50        
$                              
$ cat -n change_status.pl      
     1  #!/usr/bin/perl        
     2                         
     3  $file = "status";      
     4  $RM2 = "BLAH";         
     5                         
     6  open($fh, "<", $file) or die "Could not open $file: $!\n";
     7  @list = <$fh>;                                            
     8  close($fh);                                               
     9                                                            
    10  $list[30] = "RM=\"rm2\"\n";                   # this will affect line 31
    11  $list[37] =~ s/"$/ $RM2"/;                    # this will affect line 38
    12  $list[42] = "rm2DESC=\"Result Manager2\"\n";  # this will affect line 43
    13                                                                          
    14  open($fh, ">", $file) or die "Could not open $file: $!\n";              
    15  print $fh @list;                                                        
    16  close($fh);                                                             
$                                                                               
$ perl change_status.pl                                                         
$                                                                               
$ cat -n status                                                                 
     1  This is line 1                                                          
     2  This is line 2                                                          
     3  This is line 3                                                          
     4  This is line 4                                                          
     5  This is line 5                                                          
     6  This is line 6                                                          
     7  This is line 7                                                          
     8  This is line 8                                                          
     9  This is line 9                                                          
    10  This is line 10
    11  This is line 11
    12  This is line 12
    13  This is line 13
    14  This is line 14
    15  This is line 15
    16  This is line 16
    17  This is line 17
    18  This is line 18
    19  This is line 19
    20  This is line 20
    21  This is line 21
    22  This is line 22
    23  This is line 23
    24  This is line 24
    25  This is line 25
    26  This is line 26
    27  This is line 27
    28  This is line 28
    29  This is line 29
    30  This is line 30
    31  RM="rm2"
    32  This is line 32
    33  This is line 33
    34  This is line 34
    35  This is line 35
    36  This is line 36
    37  This is line 37
    38  Yadda="$RWHOIS $LM $RM BLAH"
    39  This is line 39
    40  This is line 40
    41  This is line 41
    42  This is line 42
    43  rm2DESC="Result Manager2"
    44  This is line 44
    45  This is line 45
    46  This is line 46
    47  This is line 47
    48  This is line 48
    49  This is line 49
    50  This is line 50
$
$

tyler_durden
 

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