add character to the end of each line in file Post: 302338002

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Top Forums Shell Programming and Scripting add character to the end of each line in file Post 302338002 by durden_tyler on Sunday 26th of July 2009 10:45:18 PM

07-26-2009

Registered User

Quote:

Originally Posted by naamas03

...
i have 32 lines in file. the length of each line is 82 , i want that in the end of each line , means in postion 83-84 to put two characters 0d(=\015), 0a(=\012)
...

If your file was created in Unix/Linux or any of their variants, then it would have "\012" (or ASCII decimal 10 or "newline" character) at the last position.

If it was created in MS Windows, DOS, OS/2 etc. then it would have "\015" and "\012" ( CR+LF ) at the last two positions.

Since you are asking about CR+LF, I'd assume your file was created in Unix/Linux and has "\n" as the end-of-line character.

The sed command proposed earlier won't give correct results because it adds "\r\n" at the end, i.e. after the "\n" at the end.

Code:

$ 
$ # my system is Linux
$ uname -o
GNU/Linux
$ 
$ # create a file
$ for i in 1 2 3 ; do
>   echo "ABCDEF-LINE:00$i"
> done >data.txt
$ 
$ cat data.txt
ABCDEF-LINE:001
ABCDEF-LINE:002
ABCDEF-LINE:003
$ 
$ # check the octal dump
$ od -bc data.txt
0000000 101 102 103 104 105 106 055 114 111 116 105 072 060 060 061 012
          A   B   C   D   E   F   -   L   I   N   E   :   0   0   1  \n
0000020 101 102 103 104 105 106 055 114 111 116 105 072 060 060 062 012
          A   B   C   D   E   F   -   L   I   N   E   :   0   0   2  \n
0000040 101 102 103 104 105 106 055 114 111 116 105 072 060 060 063 012
          A   B   C   D   E   F   -   L   I   N   E   :   0   0   3  \n
0000060
$ 
$ # so we have just the "\n" as the EOL character
$ # try the sed script
$ sed 's/$/\r\n/' data.txt > new_data.txt
$ 
$ # check the octal dump
$ od -bc new_data.txt
0000000 101 102 103 104 105 106 055 114 111 116 105 072 060 060 061 015
          A   B   C   D   E   F   -   L   I   N   E   :   0   0   1  \r
0000020 012 012 101 102 103 104 105 106 055 114 111 116 105 072 060 060
         \n  \n   A   B   C   D   E   F   -   L   I   N   E   :   0   0
0000040 062 015 012 012 101 102 103 104 105 106 055 114 111 116 105 072
          2  \r  \n  \n   A   B   C   D   E   F   -   L   I   N   E   :
0000060 060 060 063 015 012 012
          0   0   3  \r  \n  \n
0000066
$ 
$ cat new_data.txt
ABCDEF-LINE:001

ABCDEF-LINE:002

ABCDEF-LINE:003

$

Here's one way to do it in Perl:

Code:

$ 
$ cat data.txt
ABCDEF-LINE:001
ABCDEF-LINE:002
ABCDEF-LINE:003
$ 
$ perl -ne 's/\n/\r\n/; print' data.txt >mod_data.txt
$ 
$ od -bc mod_data.txt
0000000 101 102 103 104 105 106 055 114 111 116 105 072 060 060 061 015
          A   B   C   D   E   F   -   L   I   N   E   :   0   0   1  \r
0000020 012 101 102 103 104 105 106 055 114 111 116 105 072 060 060 062
         \n   A   B   C   D   E   F   -   L   I   N   E   :   0   0   2
0000040 015 012 101 102 103 104 105 106 055 114 111 116 105 072 060 060
         \r  \n   A   B   C   D   E   F   -   L   I   N   E   :   0   0
0000060 063 015 012
          3  \r  \n
0000063
$

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LEARN ABOUT CENTOS

uuencode

UUENCODE(5)							File Formats Manual						       UUENCODE(5)

NAME

       uuencode - format of an encoded uuencode file

DESCRIPTION

       Files output by uuencode(1) consist of a header line, followed by a number of body lines, and a trailer line.  The uudecode(1) command will
       ignore any lines preceding the header or following the trailer.	Lines preceding a header must not, of course, look like a header.

       The header line is distinguished by having the first 6 characters begin	This is followed by a mode (in octal), and a  string  which  names
       the remote file.  A space character separates the three items in the header line.

       The  body  consists  of	a number of lines, each at most 62 characters long (including the trailing newline).  These consist of a character
       count, followed by encoded characters, followed by a newline.  The character count is a single printing character, and represents an  inte-
       ger, the number of bytes the rest of the line represents.  Such integers are always in the range from 0 to 63 and can be determined by sub-
       tracting the character space (octal 40) from the character.

       Groups of 3 bytes are stored in 4 characters, 6 bits per character.  All are offset by a space to make the characters printing.	 The  last
       line may be shorter than the normal 45 bytes.  If the size is not a multiple of 3, this fact can be determined by the value of the count on
       the last line.  Extra garbage will be included to make the character count a multiple of 4.  The body is terminated by a line with a  count
       of zero.  This line consists of one ASCII space.

       The trailer line consists of end on a line by itself.

SEE ALSO

       uuencode(1), uudecode(1), uusend(1), uucp(1), mail(1)

HISTORY

       The uuencode file format appeared in BSD 4.0 .

																       UUENCODE(5)

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