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Full Discussion: echo backspace
Top Forums Shell Programming and Scripting echo backspace Post 302479627 by Corona688 on Sunday 12th of December 2010 12:06:59 AM
Old 12-12-2010
Quote:
Originally Posted by willie
@Corona688:

I want to fully understand how this lines of code do their job:
...badly, that's how. Smilie That's a useless use of cat and prone to truncating the list should it exceed the size of a shell variable, and even when it works it's wasteful since it reads the entire list into memory, and a bit of a hack since it uses IFS and argument lists to split lines instead of using the built-in read method. It can be done much better like this:
Code:
while read f
do
        echo $f
done < mp3file.txt

As for why IFS had a backspace in it: I have no idea. The shell doesn't process backspaces specially, so maybe his data did have real, literal backspaces in it somehow, but that's not normal. It doesn't do anything for your files, since argument splitting (or read) will break on any character in IFS, not just all of them. It's not good example.
Last edited by Corona688; 12-12-2010 at 01:13 AM..
 

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LEARN ABOUT DEBIAN

ndselect

NDSELECT(1)							   User Commands						       NDSELECT(1)

NAME

       ndselect - select lines and fields for numdiff

DESCRIPTION

       Usage: ndselect -h|--help|-v|--version	or

       ndselect [-b N][-e N][-s N][-F N][-L N][-I N][-S IFS][-x][-l PATH][-o PATH] [FILE]

       Print to standard output a subset of lines and fields from a given file.

       The  argument  after  the options is the name of the file to read from.	The complete path of the file should be given, a directory name is
       not accepted.  If no input file is specified, the program reads from the standard input.

       Exit status: 0 in case of normal termination, -1 (255) in case of error

       -b, --beginning, --start=N

	      Set to N the number of the first line to print (The default behavior is to start with line number 1)

       -e, --end=N

	      Set to N the number of the last line that can be printed (The default behavior is to arrive till to the end of the file)

       -s, --step=N

	      Set to N the increment to use when selecting the lines to print (The default value for the increment is 1)

       -F, --first-field=N

	      Set to N the number of the first field to print (The default behavior is to start with field number 1)

       -L, --last-field=N

	      Set to N the number of the last field that can be printed (The default behavior is to arrive till to the end of every line)

       -I, --increment=N

	      Set to N the increment to use when selecting the fields to print (The default value for the increment is 1)

       -S, --separator=IFS

	      Specify the set of characters to use to split the input lines into fields (The default set of characters is space, tab and newline).

       -x, --omit-empty-lines

	      Do not print empty lines

       -l, --warnings-to=PATH

	      Redirect warning and error messages from stderr to the indicated file

       -o, --output=PATH

	      Redirect output from stdout to the indicated file

       -h, --help

	      Show this help message

       -v, --version

	      Show version number, Copyright, Distribution Terms and NO-Warranty

COPYRIGHT

       Copyright (C) 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012  Ivano Primi <ivprimi@libero.it>
       License GPLv3+: GNU GPL version 3 or later, see <http://gnu.org/licenses/gpl.html>.
       This is free software: you are free to change and redistribute it.  There is NO WARRANTY, to the extent permitted by law.

SEE ALSO

       The full documentation for ndselect is maintained as a Texinfo manual.  If the info and ndselect programs are properly  installed  at  your
       site, the command

	      info numdiff

       should give you access to the complete manual.

ndselect 5.6.0							   January 2012 						       NDSELECT(1)
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