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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 LINUX

deb-old

deb-old(5)							      Debian								deb-old(5)

NAME

       deb-old - old style Debian binary package format

SYNOPSIS

       filename.deb

DESCRIPTION

       The  .deb  format  is the Debian binary package file format. This manual page describes the old format, used before Debian 0.93. Please see
       deb(5) for details of the new format.

FORMAT

       The file is two lines of format information as ASCII text, followed by two concatenated gzipped ustar files.

       The first line is the format version number padded to 8 digits, and is 0.939000 for all old-format archives.

       The second line is a decimal string (without leading zeroes) giving the length of the first gzipped tarfile.

       Each of these lines is terminated with a single newline character.

       The first tarfile contains the control information, as a series of ordinary files. The file control must be present,  as  it  contains  the
       core control information.

       In  some very old archives, the files in the control tarfile may optionally be in a DEBIAN subdirectory. In that case, the DEBIAN subdirec-
       tory will be in the control tarfile too, and the control tarfile will have only files in that directory. Optionally the control tarfile may
       contain an entry for `.', that is, the current directory.

       The second gzipped tarfile is the filesystem archive, containing pathnames relative to the root directory of the system to be installed on.
       The pathnames do not have leading slashes.

SEE ALSO

       deb(5), dpkg-deb(1), deb-control(5).

Debian Project							    2006-02-28								deb-old(5)
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