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Top Forums Shell Programming and Scripting Mac script - issue with tab delimited input file Post 302548576 by Corona688 on Thursday 18th of August 2011 07:15:43 PM
Old 08-18-2011
Quote:
Originally Posted by GRIMESPACE
Ok - trying to unscramble this...
- first lines make a temp copy of the input file and put a newline character at the end
- next section loops through the file

I'm not clear on what the line '[ -z "$LINE" ] && continue' does. Is it jumping to the 'done' line, which would skip my processing code?
It would, but only if the line is completely, utterly blank anyway. That's what -z means.

The idea is, if we add an extra newline to a file which doesn't need one, that won't add an extra line -- and an invalid one, at that -- to your processing.
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cr(1)							      General Commands Manual							     cr(1)

NAME
cr - converts text files between nix EOL and dos EOL SYNOPSIS
cr - | + <input file> <output file> DESCRIPTION
Text files, such as tle files, that come from a dos source usualy have the ^M symbol at the end of every line. Cr converts files between the dos newline format and the normal *nix newline format by stripping the ^M to convert dos to *nix, using the '-' option, or adding ^M to a *nix file to create the proper dos file when the '+' option is used. Although this extra character is not often a problem, programs like seesat5, which are data driven will encounter parsing problems when the extra character is present. It is these problems that cr is intended to repair. Options - | + One or the other of these options is required. The '-' option is used to remove ^M from all newlines found in the dos file. The '+' option is used to add ^M to every newline found in a *nix file. input file Fully delineated path to the input file. As this program is used in the dos environment as well, standard input is not used. output file Fully delineated path to the output file. As this program is used in the dos environment as well, standart output is not used. SEE ALSO
seesat5(1), seesat5(7), SEESAT5.INI(5), tle(5) BUGS
Cr is not an inteligent program. It methodicaly replaces/removes the offending character when it finds it in the correct context. Newline sequences found in contexts other than 'newline' will be replaced/removed just like those found in the proper context. Passing a binary file through cr is not advised, for this reason. Send all inqueries to Dale Scheetz <dwarf@polaris.net>. Debian Linux 2 April 96 cr(1)
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