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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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continue(3tcl)						       Tcl Built-In Commands						    continue(3tcl)

__________________________________________________________________________________________________________________________________________________

NAME
continue - Skip to the next iteration of a loop SYNOPSIS
continue _________________________________________________________________ DESCRIPTION
This command is typically invoked inside the body of a looping command such as for or foreach or while. It returns a TCL_CONTINUE code, which causes a continue exception to occur. The exception causes the current script to be aborted out to the innermost containing loop command, which then continues with the next iteration of the loop. Catch exceptions are also handled in a few other situations, such as the catch command and the outermost scripts of procedure bodies. EXAMPLE
Print a line for each of the integers from 0 to 10 except 5: for {set x 0} {$x<10} {incr x} { if {$x == 5} { continue } puts "x is $x" } SEE ALSO
break(3tcl), for(3tcl), foreach(3tcl), return(3tcl), while(3tcl) KEYWORDS
continue, iteration, loop Tcl continue(3tcl)
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