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Full Discussion: Bash array variables are changed in loop runtime
Top Forums UNIX for Beginners Questions & Answers Bash array variables are changed in loop runtime Post 302985788 by tmalik79 on Tuesday 15th of November 2016 08:59:43 AM
Old 11-15-2016
Bash array variables are changed in loop runtime
I am trying to check whether particular host and port are responding or not. I am using below script to check. but node_port array that i am using in loop is getting replaced with previous iteration value. Script and output is given.

Please help me to understanding why node_port values are replaced and how to avoid that.

I am using bash shell for executing this.

Code:
host_names=(xx.yy.zz.167 xx.yy.zz.168 xx.yy.zz.169 xx.yy.zz.170 xx.yy.zz.171 xx.yy.zz.172)
node_port=(2100 2200 2300 2400 2500)

while :
do
        LoopstartTime=$(date '+%Y-%m-%d %r %Z')
        unset i j
        for i in "${host_names[@]}"
        do
                echo "First Loop-$i"
                for j in "${node_port[@]}"
                do
                  echo "        Second Loop-$j"
                  echo "        variables list ${node_port[@]}"
                  echo "        no of arg ${#node_port[@]}"
                  unset j
                done
        done
        LoopendTime=$(date '+%Y-%m-%d %r %Z')
        echo "Process started at ${LoopstartTime} and Completed at ${LoopendTime}"
        echo " "
        sleep $wait_time
done

Output is
Quote:
First Loop-xx.yy.zz.167
Second Loop-2100
variables list 2100 2200 2300 2400 2500
no of arg 5
Second Loop-2200
variables list 2100 2200 2300 2400 2500
no of arg 5
Second Loop-2300
variables list 2200 2200 2300 2400 2500
no of arg 5
Second Loop-2400
variables list 2300 2200 2300 2400 2500
no of arg 5
Second Loop-2500
variables list 2400 2200 2300 2400 2500
no of arg 5
Last edited by tmalik79; 11-16-2016 at 01:28 AM.. Reason: formating
 

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LEARN ABOUT MINIX

isp

ISP(4)							   BSD Kernel Interfaces Manual 						    ISP(4)

NAME

     isp -- Qlogic based SCSI and FibreChannel SCSI Host Adapters

SYNOPSIS

     To compile this driver into the kernel, place the following lines in your kernel configuration file:

	   device scbus
	   device isp

     Alternatively, to load the driver as a module at boot time, place the following line in loader.conf(5):

	   isp_load="YES"

DESCRIPTION

     This driver provides access to SCSI or FibreChannel devices.

     SCSI features include support for Ultra SCSI and wide mode transactions for SCSI, Ultra2 LVD (for the ISP1080 and ISP1280), and Ultra3 LVD
     (for the ISP12160).

     Fibre Channel support uses FCP SCSI profile for FibreChannel.  and utilizes Class 3 and Class 2 connections (Qlogic 2100 is Class 3 only,
     minor patches to the Qlogic 2200 to force Class 2 mode).  Support is available for Public and Private loops, and for point-to-point connec-
     tions (Qlogic 2200 only).	The newer 2-Gigabit cards (2300, 2312, 2322) and 4-Gigabit (2422, 2432) are also supported.  Command tagging is
     supported for all (in fact, FibreChannel requires tagging).  Fabric support is enabled by default for other than 2100 cards.  Fabric support
     for 2100 cards has been so problematic and these cards are so old now that it is just not worth your time to try it.

FIRMWARE

     Firmware is available if the ispfw(4) module is loaded during bootstrap (q.v.).

     It is strongly recommended that you use the firmware available from ispfw(4) as it is the most likely to have been tested with this driver.

HARDWARE

     Cards supported by the isp driver include:

	   ISP1000
		   SBus Fast Wide, Ultra Fast Wide cards, Single Ended or Differential cards.

	   ISP1020
		   Qlogic 1020 Fast Wide and Differential Fast Wide PCI cards.

	   ISP1040
		   Qlogic 1040 Ultra Wide and Differential Ultra Wide PCI cards.  Also known as the DEC KZPBA-CA (single ended) and KZPBA-CB (HVD
		   differential).

	   Qlogic 1240
		   Qlogic 1240 Dual Bus Ultra Wide and Differential Ultra Wide PCI cards.

	   Qlogic 1020
		   Qlogic 1020 SCSI cards.

	   Qlogic 1040
		   Qlogic 1040 Ultra SCSI cards.

	   Qlogic 1080
		   Qlogic 1280 LVD Ultra2 Wide PCI cards.

	   Qlogic 1280
		   Qlogic 1280 Dual Bus LVD Ultra2 Wide PCI cards.

	   Qlogic 12160
		   Qlogic 12160 Dual Bus LVD Ultra3 Wide PCI cards.

	   Qlogic 210X
		   Qlogic 2100 and 2100A Copper and Optical Fibre Channel Arbitrated Loop (single, dual).

	   Qlogic 220X
		   Qlogic 2200 Copper and Optical Fibre Channel Arbitrated Loop PCI cards (single, dual, quad).

	   Qlogic 2300
		   Qlogic 2300 Optical Fibre Channel PCI cards.

	   Qlogic 2312
		   Qlogic 2312 Optical Fibre Channel PCI cards.

	   Qlogic 234X
		   Qlogic 234X Optical Fibre Channel PCI cards (2312 chipset, single and dual attach).

	   Qlogic 2322
		   Qlogic 2322 Optical Fibre Channel PCIe cards.

	   Qlogic 200
		   Dell Branded version of the QLogic 2312 Fibre Channel PCI cards.

	   Qlogic 2422
		   Qlogic 2422 Optical Fibre Channel PCI cards (4 Gigabit)

	   Qlogic 2432
		   Qlogic 2432 Optical Fibre Channel PCIe cards (4 Gigabit)

CONFIGURATION OPTIONS

     Target mode support may be enabled with the

     options ISP_TARGET_MODE

     option.

BOOT OPTIONS

     The following options are switchable by setting values in /boot/device.hints.

     They are:

     hint.isp.0.disable
	     A hint value to disable driver in kernel.

     hint.isp.0.fwload_disable
	     A hint value to disable loading of firmware ispfw(4).

     hint.isp.0.prefer_memmap
	     A hint value to use PCI memory space instead of I/O space access for.

     hint.isp.0.prefer_iomap
	     A hint value to use PCI I/O space instead of Memory space access for.

     hint.isp.0.ignore_nvram
	     A hint value to ignore board NVRAM settings for.  Otherwise use NVRAM settings.

     hint.isp.0.fullduplex
	     A hint value to set full duplex mode.

     hint.isp.0.topology
	     A hint value to select topology of connection.  Supported values are:

	     lport	 Prefer loopback and fallback to point to point.
	     nport	 Prefer point to point and fallback to loopback.
	     lport-only  Loopback only.
	     nport-only  Point to point only.

     hint.isp.0.portwwn
	     This should be the full 64 bit World Wide Port Name you would like to use, overriding the value in NVRAM for the card.

     hint.isp.0.nodewwn
	     This should be the full 64 bit World Wide Node Name you would like to use, overriding the value in NVRAM for the card.

     hint.isp.0.iid
	     A hint to override or set the Initiator ID or Loop ID.  For Fibre Channel cards in Local Loop topologies it is strongly recommended
	     that you set this value to non-zero.

     hint.isp.0.role
	     A hint to define default role for isp instance (target, initiator, both).

     hint.isp.0.debug
	     A hint value for a driver debug level (see the file /usr/src/sys/dev/isp/ispvar.h for the values.

SYSCTL OPTIONS

     dev.isp.N.loop_down_limit
	     This value says how long to wait in seconds after loop has gone down before giving up and expiring all of the devices that were visi-
	     ble.  The default is 300 seconds (5 minutes).  A separate (nonadjustable) timeout is used when booting to not stop booting on lack of
	     FC connectivity.

     dev.isp.N.gone_device_time
	     This value says how long to wait for devices to reappear if they (temporarily) disappear due to loop or fabric events.  While this
	     timeout is running, I/O to those devices will simply be held.

     dev.isp.N.wwnn
	     This is the readonly World Wide Node Name value for this port.

     dev.isp.N.wwpn
	     This is the readonly World Wide Port Name value for this port.

SEE ALSO

     da(4), intro(4), ispfw(4), sa(4), scsi(4), gmultipath(8)

AUTHORS

     The isp driver was written by Matthew Jacob originally for NetBSD at NASA/Ames Research Center.

BUGS

     The driver currently ignores some NVRAM settings.

     Target mode support is not completely reliable yet.  It works reasonably well for Fibre Channel, somewhat well for Qlogic 1040 cards, but
     does not yet work for the other cards (due to last minute unannounced changes in firmware interfaces).

BSD
								 February 28, 2007							       BSD
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