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Full Discussion: While loop not reading all files if ssh fails
Top Forums Shell Programming and Scripting While loop not reading all files if ssh fails Post 302844903 by LES2013 on Tuesday 20th of August 2013 09:03:39 AM
Old 08-20-2013
Through a LOT of trial and error and researching on the net I came across the below while loop
syntax just a little while ago, the first example below. I changed my while loop to match and it
works yet I do not understand why it works. The echo of $? after each ssh “rm” failure is 1 as
it should be because the files do not exit. I am testing the error condition for when a file does not
exist. I would like to understand the reason the syntax works. The previous while loop after the
first file rm failure had control go back to the read and then the script stopped; I used “set -xv”.
It was as if the “rm” failure triggered an EOF.

Code:
while IFS= read -r f <&3;
do
     #do something with "$f"
     rm -f "$f"
done 3< delete.txt
 
while IFS= read -r FileName <&3;
do
       echo `date` '      Deleting file..............................: ' $FileName >> $AUD_DIR/app.log
 
       ssh -i $SSH_DIR/m5kdom6.adc.webserver.pri -b $SrcIP $ADCuid@$AdcIP "rm $DataDir/$FileName" > $LOG_DAY/delete.adc.bill.files.log 2>&1
 
       echo 'RC: ' $?
done 3< $LOG_DAY/bill.files.pulled.lst

 

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LEARN ABOUT DEBIAN

nwdiag

NWDIAG(1)						      General Commands Manual							 NWDIAG(1)

NAME

       nwdiag - generate network-diagram image file from spec-text file.

SYNOPSIS

       nwdiag [options] files

DESCRIPTION

       This manual page documents briefly the nwdiag commands.

       nwdiag is generate sequence-diagram image file from spec-text file.

OPTIONS

       These  programs	follow	the  usual  GNU  command  line	syntax, with long options starting with two dashes (`-').  A summary of options is
       included below.	For a complete description, see the Info files.

       -h, --help
	      show this help message and exit.

       --version
	      show program's version number and exit.

       -a, --antialias
	      Pass diagram image to anti-alias filter.

       -c FILE, --config=FILE
	      read configurations from FILE.

       -o FILE
	      write diagram to FILE.

       -f FONT, --font=FONT
	      use FONT to draw diagram.

       -T TYPE
	      Output diagram as TYPE format.

SEE ALSO

       The programs are documented fully by
       http://blockdiag.com/en/nwdiag/

AUTHOR

       nwdiag was written by Takeshi Komiya <i.tkomiya@gmail.com>

       This manual page was written by Kouhei Maeda <mkouhei@palmtb.net>, for the Debian project (and may be used by others).

								   June 11, 2011							 NWDIAG(1)
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