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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 MOJAVE

vconsole.conf

VCONSOLE.CONF(5)                                                   vconsole.conf                                                  VCONSOLE.CONF(5)

NAME

       vconsole.conf - configuration file for the virtual console

SYNOPSIS

       /etc/vconsole.conf

DESCRIPTION

       The /etc/vconsole.conf file configures the virtual console, i.e. keyboard mapping and console font.

       The basic file format of the vconsole.conf is a newline-separated list environment-like shell-compatible variable assignments. It is
       possible to source the configuration from shell scripts, however, beyond mere variable assignments no shell features are supported,
       allowing applications to read the file without implementing a shell compatible execution engine.

       Note that the kernel command line options vconsole.keymap=, vconsole.keymap.toggle=, vconsole.font=, vconsole.font.map=,
       vconsole.font.unimap= may be used to override the console settings at boot.

       Depending on the operating system other configuration files might be checked for configuration of the virtual console as well, however only
       as fallback.

OPTIONS

       The following options are understood:

       KEYMAP=, KEYMAP_TOGGLE=
           Configures the key mapping table of for they keyboard.  KEYMAP= defaults to us if not set. The KEYMAP_TOGGLE= can be used to configured
           a second toggle keymap and is by default unset.

       FONT=, FONT_MAP=, FONT_UNIMAP=
           Configures the console font, the console map and the unicode font map.  FONT= defaults to latarcyrheb-sun16.

EXAMPLE

       Example 1. German keyboard and console

       /etc/vconsole.conf:

           KEYMAP=de-latin1
           FONT=latarcyrheb-sun16

SEE ALSO

       systemd(1), loadkeys(1), setfont(8), locale.conf(5)

AUTHOR

       Lennart Poettering <lennart@poettering.net>
           Developer

systemd                                                             10/07/2013                                                    VCONSOLE.CONF(5)
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