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Full Discussion: Problem in concatenating two Strings
Top Forums Shell Programming and Scripting Problem in concatenating two Strings Post 302581646 by methyl on Tuesday 13th of December 2011 04:57:00 PM
Old 12-13-2011
Good guess on my part!
The script is riddled with carriage-return characters (showing as \r). These usually come from using Microsoft editors (such as Notepad).
A unix text file has every line terminated with a line-feed character.
A MSDOS text file has every line terminated with two characters carriage-return then line-feed. This is a left-over from one of the greatest MSDOS mistakes.

To fix your script we can use the unix "tr" command to remove the MSDOS c**p .

Code:
cat oldscriptname | tr -d '\r' > newscriptname
chmod 755 newscriptname

When you are happy with "newscriptname", you can of course issue:
Code:
mv newscriptname oldscriptname

Don't forget to check your solidii in the final script!



Just in case you don't get what is happening here. The carriage return character moves the cursor on your screen to the far left. Thus your field you expected to be on the right hand side was jumped to the left hand side and overwrote part of what had been already displayed. It's an effect on the screen. The "sed -l" version of the output from your script showed that the script itself is basically sound but that you need to pay some attention to solidii and the extra space character. The carriage-return characters just messed-up the output.


Important: You are destined to become a great Systems Administrator. You can present a problem clearly and follow instructions. Good luck in your future career.

Btw: Post #3 mentions csh. This Shell has no place in unix Systems Administration. My advice, don't use it.
Last edited by methyl; 12-13-2011 at 06:22 PM.. Reason: schoolboy error in mv ! assorted other typos
This User Gave Thanks to methyl For This Post:
kuldeept
 

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LEARN ABOUT FREEBSD

asa

ASA(1)							    BSD General Commands Manual 						    ASA(1)

NAME

     asa -- interpret carriage-control characters

SYNOPSIS

     asa [file ...]

DESCRIPTION

     The asa utility reads files sequentially, mapping FORTRAN carriage-control characters to line-printer control sequences, and writes them to
     the standard output.

     The first character of each line is interpreted as a carriage-control character.  The following characters are interpreted as follows:

     <space>  Output the rest of the line without change.

     0	      Output a <newline> character before printing the rest of the line.

     1	      Output a <formfeed> character before printing the rest of the line.

     +	      The trailing <newline> of the previous line is replaced by a <carriage-return> before printing the rest of the line.

     Lines beginning with characters other than the above are treated as if they begin with <space>.

EXIT STATUS

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

EXAMPLES

     To view a file containing the output of a FORTRAN program:

	   asa file

     To format the output of a FORTRAN program and redirect it to a line-printer:

	   a.out | asa | lpr

SEE ALSO

     f77(1)

STANDARDS

     The asa utility conforms to IEEE Std 1003.1-2001 (``POSIX.1'').

AUTHORS

     J.T. Conklin, Winning Strategies, Inc.

BSD
								    May 9, 2002 							       BSD
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