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Top Forums Shell Programming and Scripting My for loop decides to become an infinite loop? Post 302580491 by gotreef on Thursday 8th of December 2011 05:02:48 PM
Old 12-08-2011
@Corona

This is exactly what I was hoping for. You're telling me that how I think about scripting is garbage and why it's bad. Although telling me how poorly I've written my script, I feel that this better belongs in the noob section.

What I'm trying to do is a bit obtuse so please forgive me if it's poorly explained:
I have a series of satellite images from various locations which are named along the lines of:
Image_date_location
Image_date_location.hdr

These images are of a pixel size (30m) but I'm going to fuzz them out to simulate larger pixel footprints, (250m, 375m, 500m, and 1km); this is accomplished with spatbsq and specifying the parameter $res.

After the 'spatbsq' is done, it should output:
Image_date_location.250m
Image_date_location.250m.hdr
and so on for all I would in theory end up with 4 new files for every original file, one for each resolution.

It's good to know that I shouldn't use backticks in these cases
Could you (or someone else) possibly explain to me what 'done < /tmp/$$' does and why $$ is used instead of a file name?
 

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break(1)                                                           User Commands                                                          break(1)

NAME
break, continue - shell built-in functions to escape from or advance within a controlling while, for, foreach, or until loop SYNOPSIS
sh break [n] continue [n] csh break continue ksh *break [n] *continue [n] DESCRIPTION
sh The break utility exits from the enclosing for or while loop, if any. If n is specified, break n levels. The continue utility resumes the next iteration of the enclosing for or while loop. If n is specified, resume at the n-th enclosing loop. csh The break utility resumes execution after the end of the nearest enclosing foreach or while loop. The remaining commands on the current line are executed. This allows multilevel breaks to be written as a list of break commands, all on one line. The continue utility continues execution of the next iteration of the nearest enclosing while or foreach loop. ksh The break utility exits from the enclosed for, while, until, or select loop, if any. If n is specified, then break n levels. If n is greater than the number of enclosing loops, the outermost enclosing loop shall be exited. The continue utility resumes the next iteration of the enclosed for, while, until, or select loop. If n is specified then resume at the n- th enclosed loop. If n is greater than the number of enclosing loops, the outermost enclosing loop shall be used. On this man page, ksh(1) commands that are preceded by one or two * (asterisks) are treated specially in the following ways: 1. Variable assignment lists preceding the command remain in effect when the command completes. 2. I/O redirections are processed after variable assignments. 3. Errors cause a script that contains them to abort. 4. Words that follow a command preceded by ** that are in the format of a variable assignment are expanded with the same rules as a vari- able assignment. This means that tilde substitution is performed after the = sign, and also that word splitting and file name genera- tion are not performed. ATTRIBUTES
See attributes(5) for descriptions of the following attributes: +-----------------------------+-----------------------------+ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | +-----------------------------+-----------------------------+ |Availability |SUNWcsu | +-----------------------------+-----------------------------+ SEE ALSO
csh(1), exit(1), ksh(1), sh( 1), attributes(5) SunOS 5.10 17 Jul 2002 break(1)
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