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Shell Programming and Scripting
While loop variable
Post 302770333 by zaxxon on Friday 15th of February 2013 08:43:56 AM
02-15-2013
Ok 
The problem will most probably be, that the DB client you are using, will just show a RC of 0 all the time, no matter if the SQL statement issued was successful or not.
You got the same issue, if you do something with a ftp client or any other client, that works fine in terms of itself, no matter what errors you get "inside" the client. There is usually issued a 0 back to the shell as the client says "Hey man, I am fine, not my fault the commands you issued didn't work because of <insertsomethingthatwentwrong>".
Can simply check this if you add a echo $RC after defining $RC while issuing an intentionally failing SQL statement in the line above.
I am not sure if there is any kind of option for your DB client to pass any other RC through to the shell. Could check it's documentation maybe; or grep for a pattern that shows the success/fail of the operation.
Update:
For DB2 I found that the client returns appropriate RCs:
http://publib.boulder.ibm.com/infoce...e/r0010411.htm
Just as an example that some clients do that.
The problem will most probably be, that the DB client you are using, will just show a RC of 0 all the time, no matter if the SQL statement issued was successful or not.
You got the same issue, if you do something with a ftp client or any other client, that works fine in terms of itself, no matter what errors you get "inside" the client. There is usually issued a 0 back to the shell as the client says "Hey man, I am fine, not my fault the commands you issued didn't work because of <insertsomethingthatwentwrong>".
Can simply check this if you add a echo $RC after defining $RC while issuing an intentionally failing SQL statement in the line above.
I am not sure if there is any kind of option for your DB client to pass any other RC through to the shell. Could check it's documentation maybe; or grep for a pattern that shows the success/fail of the operation.
Update:
For DB2 I found that the client returns appropriate RCs:
http://publib.boulder.ibm.com/infoce...e/r0010411.htm
Just as an example that some clients do that.
Last edited by zaxxon; 02-15-2013 at 09:56 AM.. Reason: added info
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LEARN ABOUT MINIX
ppmtosixel
ppmtosixel(1) General Commands Manual ppmtosixel(1) NAME
ppmtosixel - convert a portable pixmap into DEC sixel format SYNOPSIS
ppmtosixel [-raw] [-margin] [ppmfile] DESCRIPTION
Reads a portable pixmap as input. Produces sixel commands (SIX) as output. The output is formatted for color printing, e.g. for a DEC LJ250 color inkjet printer. If RGB values from the PPM file do not have maxval=100, the RGB values are rescaled. A printer control header and a color assignment table begin the SIX file. Image data is written in a compressed format by default. A printer control footer ends the image file. OPTIONS
-raw If specified, each pixel will be explicitly described in the image file. If -raw is not specified, output will default to com- pressed format in which identical adjacent pixels are replaced by "repeat pixel" commands. A raw file is often an order of magni- tude larger than a compressed file and prints much slower. -margin If -margin is not specified, the image will be start at the left margin (of the window, paper, or whatever). If -margin is speci- fied, a 1.5 inch left margin will offset the image. PRINTING
Generally, sixel files must reach the printer unfiltered. Use the lpr -x option or cat filename > /dev/tty0?. BUGS
Upon rescaling, truncation of the least significant bits of RGB values may result in poor color conversion. If the original PPM maxval was greater than 100, rescaling also reduces the image depth. While the actual RGB values from the ppm file are more or less retained, the color palette of the LJ250 may not match the colors on your screen. This seems to be a printer limitation. SEE ALSO
ppm(5) AUTHOR
Copyright (C) 1991 by Rick Vinci. 26 April 1991 ppmtosixel(1)