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Help about parse the variable

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Top Forums Shell Programming and Scripting Help about parse the variable
# 1  
Old 12-17-2012
Help about parse the variable
I'm using bash the code is

Code:
        QEMU_CMD="qemu-system-x86_64 -smp 2 -m 512 $QEMU_PARAMETER -hda $GUEST_IMAGE  -kernel $GUEST_KERNEL -append \"root=/dev/hda rw console=ttyS0,115200 ip=$IP_PARAMETER \" -nographic"
        echo "..............................."
        echo "qemu command is :"
        echo "$QEMU_CMD"
        echo "..............................."
        $QEMU_CMD

The log is
Code:
qemu command is :
qemu-system-x86_64 -smp 2 -m 512 -net nic,macaddr=52:54:00:65:43:21 -net tap,script=/etc/qemu-ifup -hda /boot/guest_raw.img  -kernel /boot/bzImage -append "root=/dev/hda rw console=ttyS0,115200 ip=dhcp " -nographic
...............................
qemu-system-x86_64: -append "root=/dev/hda: drive with bus=0, unit=0 (index=0) exists

Obviously, it parse the QEMU_CMD wrongly, but if I copy above log's cmd below it works well
Code:
qemu-system-x86_64 -smp 2 -m 512 -net nic,macaddr=52:54:00:65:43:21 -net  tap,script=/etc/qemu-ifup -hda /boot/guest_raw.img  -kernel  /boot/bzImage -append "root=/dev/hda rw console=ttyS0,115200 ip=dhcp "  -nographic

any help?
# 2  
Old 12-17-2012
If you want to execute the command, you need to use command substitution.

Code:
QEMU_CMD=$(qemu-system-x86_64 ...)

# 3  
Old 12-17-2012
Quote:
Originally Posted by Scott
If you want to execute the command, you need to use command substitution.

Code:
QEMU_CMD=$(qemu-system-x86_64 ...)


It doesn't work still say "qemu-system-x86_64: -append "root=/dev/hda: drive with bus=0, unit=0 (index=0) exists"
# 4  
Old 12-17-2012
You are getting an error from the command itself - you are trying to set up an emulated device that is already set up. I think you are misusing the command itself, which I know very little about.
# 5  
Old 12-17-2012
Quote:
Originally Posted by jim mcnamara
You are getting an error from the command itself - you are trying to set up an emulated device that is already set up. I think you are misusing the command itself, which I know very little about.
NO, becasue I derectly use below cmd which print by echo "$QEMU_CMD" it works


Code:
qemu-system-x86_64 -smp 2 -m 512 -net nic,macaddr=52:54:00:65:43:21 -net tap,script=/etc/qemu-ifup -hda /boot/guest_raw.img  -kernel /boot/bzImage -append "root=/dev/hda rw console=ttyS0,115200 ip=dhcp " -nographic

# 6  
Old 12-17-2012
Can you please show the exact command you are running (the one using command substitution, that is)?
# 7  
Old 12-17-2012
Quote:
Originally Posted by Scott
Can you please show the exact command you are running (the one using command substitution, that is)?

Code:
GUEST_IMAGE="/boot/guest_raw.img"
GUEST_KERNEL="/boot/bzImage"
IP_PARAMETER="dhcp"
QEMU_IFUP_SCRIPT="/etc/qemu-ifup"
QEMU_PARAMETER="-net nic,macaddr=$GUEST_MAC -net tap,script=$QEMU_IFUP_SCRIPT"

        QEMU_CMD="qemu-system-x86_64 -smp 2 -m 512 $QEMU_PARAMETER -hda $GUEST_IMAGE  -kernel $GUEST_KERNEL -append \"root=/dev/hda rw console=ttyS0,115200 ip=$IP_PARAMETER \" -nographic"
        echo "..............................."
        echo "qemu command is :"
        echo "$QEMU_CMD"
        echo "..............................."
        $QEMU_CMD


It's really strange for me
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