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Full Discussion: Formatting file data to another file (control character related)
Top Forums Shell Programming and Scripting Formatting file data to another file (control character related) Post 302704595 by bakunin on Saturday 22nd of September 2012 11:41:24 AM
Old 09-22-2012
I suppose the problem being the "echo" statement. It is fed the content of the variable "$line" and interprets it. "\n" and "\t" in your example are control characters, though. "\n" is "newline", "\t" is tab.

Anyhow, your implementation isn't all too good anyway, because you use several commands and a pipeline to do what shell exansion could do too - at considerably less computing costs:

Code:
x="abc|def|ghi|jkl"
echo "${x%%|*}"
echo "${x#*|}"
y="${x#*|}"
x="${x#${y}|}"
echo "${x%%|*}"
echo "${x#*|}"

Change your code accordingly and it should not only work but run faster too.

An independent observation: DO NOT use backticks any more. They are deprecated and the shell only understands them for backward compatibility issues. Use the modern "$(...)" instead, which is a lot more flexible, can be nested, can be quoted, ...

Another hint: in case you write for Korn shell you might consider using file descriptors instead of redirection. Instead of:

Code:
command1 > "$file"
command2 >> "$file"
command3 >> "$file"
...etc.

you can write:

Code:
exec 3> "$file"     # file descriptor 3 to write into $file
# exec 3>> "$file"    # alternatively open it in append mode

print -u3 - "first line"        # -u3 is FD 3
print -u3 - "second line"
print -u3 - "third line"

exec 3>&-                 # close FD 3

I hope this helps.

bakunin
Last edited by bakunin; 09-22-2012 at 12:50 PM..
This User Gave Thanks to bakunin For This Post:
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LEARN ABOUT SUSE

echo

ECHO(1) 							   User Commands							   ECHO(1)

NAME

       echo - display a line of text

SYNOPSIS

       echo [SHORT-OPTION]... [STRING]...
       echo LONG-OPTION

DESCRIPTION

       Echo the STRING(s) to standard output.

       -n     do not output the trailing newline

       -e     enable interpretation of backslash escapes

       -E     disable interpretation of backslash escapes (default)

       --help display this help and exit

       --version
	      output version information and exit

       If -e is in effect, the following sequences are recognized:

       NNN  the character whose ASCII code is NNN (octal)

       \     backslash

       a     alert (BEL)

            backspace

       c     produce no further output

       f     form feed

       
     new line

       
     carriage return

       	     horizontal tab

       v     vertical tab

       NOTE: your shell may have its own version of echo, which usually supersedes the version described here.	Please refer to your shell's docu-
       mentation for details about the options it supports.

AUTHOR

       Written by Brian Fox and Chet Ramey.

REPORTING BUGS

       Report echo bugs to bug-coreutils@gnu.org
       GNU coreutils home page: <http://www.gnu.org/software/coreutils/>
       General help using GNU software: <http://www.gnu.org/gethelp/>

COPYRIGHT

       Copyright (C) 2009 Free Software Foundation, Inc.  License GPLv3+: GNU GPL version 3 or later <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 echo is maintained as a Texinfo manual.  If the info and echo programs are properly installed at your site,  the
       command

	      info coreutils 'echo invocation'

       should give you access to the complete manual.

GNU coreutils 7.1						     July 2010								   ECHO(1)
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