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 NETBSD

paste

PASTE(1)						    BSD General Commands Manual 						  PASTE(1)

NAME

     paste -- merge corresponding or subsequent lines of files

SYNOPSIS

     paste [-s] [-d list] file ...

DESCRIPTION

     The paste utility concatenates the corresponding lines of the given input files, replacing all but the last file's newline characters with a
     single tab character, and writes the resulting lines to standard output.  If end-of-file is reached on an input file while other input files
     still contain data, the file is treated as if it were an endless source of empty lines.

     The options are as follows:

     -d list	 Use one or more of the provided characters to replace the newline characters instead of the default tab.  The characters in list
		 are used circularly, i.e., when list is exhausted the first character from list is reused.  This continues until a line from the
		 last input file (in default operation) or the last line in each file (using the -s option) is displayed, at which time paste
		 begins selecting characters from the beginning of list again.

		 The following special characters can also be used in list:

		 
    newline character
		 	    tab character
		 \    backslash character
		     Empty string (not a null character).

		 Any other character preceded by a backslash is equivalent to the character itself.

     -s 	 Concatenate all of the lines of each separate input file in command line order.  The newline character of every line except the
		 last line in each input file is replaced with the tab character, unless otherwise specified by the -d option.

     If '-' is specified for one or more of the input files, the standard input is used; standard input is read one line at a time, circularly,
     for each instance of '-'.

     The paste utility exits 0 on success, and >0 if an error occurs.

SEE ALSO

     cut(1)

STANDARDS

     The paste utility is expected to be IEEE Std 1003.2 (``POSIX.2'') compatible.

BSD
								   June 6, 1993 							       BSD

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