LinuxQuestions.org - Line Replacement help needed.

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Line Replacement help needed.

I have a file called vm.cfg which looks like follows

Code:

[root@OVM-SERVER1 vm_temp]# cat vm.cfg

acpi = 1

apic = 1

builder = 'hvm'

device_model = '/usr/lib/xen/bin/qemu-dm'

disk = ['file:/var/ovs/mount/93B14928C7A6438284753B2F2AB197BB/seed_pool/vm_temp/System.img,hda,w',

'file:/OVS/iso_pool/winxpsp2/WXPVOL_EN.iso,hdc:cdrom,r',

]

kernel = '/usr/lib/xen/boot/hvmloader'

memory = '300'

name = 'vm_temp'

on_crash = 'restart'

on_reboot = 'restart'

pae = 1

serial = 'pty'

timer_mode = '0'

usbdevice = 'tablet'

uuid = '8569c556-fdf9-41f7-93f4-52350560b13c'

vcpus = 1

vif = ['bridge=xenbr0,mac=00:16:3E:64:FB:D3,type=ioemu']

vif_other_config = []

vnc = 1

vncconsole = 1

vnclisten = '0.0.0.0'

vncpasswd = 'oracle'

vncunused = 1

I want to replace a line starting with name = to whatever value i need to assign .For ex.in above file name is assigned 'vm_temp' .I want to create a script which will ask user for a value for name and then assign the same.

I have used following sed command but there is little bug in it .
Please help me to modify it.

Code:

[root@OVM-SERVER1 vm_temp]# sed "s/^name/name = newvalue/g" vm.cfg

Above code produces following output.

Code:

[root@OVM-SERVER1 vm_temp]# sed "s/^name/name = newvalue/g" vm.cfg

acpi = 1

apic = 1

builder = 'hvm'

device_model = '/usr/lib/xen/bin/qemu-dm'

disk = ['file:/var/ovs/mount/93B14928C7A6438284753B2F2AB197BB/seed_pool/vm_temp/System.img,hda,w',

'file:/OVS/iso_pool/winxpsp2/WXPVOL_EN.iso,hdc:cdrom,r',

]

kernel = '/usr/lib/xen/boot/hvmloader'

memory = '300'

name = newvalue = 'vm_temp'

on_crash = 'restart'

on_reboot = 'restart'

pae = 1

serial = 'pty'

timer_mode = '0'

usbdevice = 'tablet'

uuid = '8569c556-fdf9-41f7-93f4-52350560b13c'

vcpus = 1

vif = ['bridge=xenbr0,mac=00:16:3E:64:FB:D3,type=ioemu']

vif_other_config = []

vnc = 1

vncconsole = 1

vnclisten = '0.0.0.0'

vncpasswd = 'oracle'

vncunused = 1

please help.

Code:

sed "s/^name =.*$/name = newvalue/g" vm.cfg

Quote:

Originally Posted by pinga123 (Post 3745383)

I have a file called vm.cfg which looks like follows

Code:

[root@OVM-SERVER1 vm_temp]# cat vm.cfg

acpi = 1

apic = 1

builder = 'hvm'

device_model = '/usr/lib/xen/bin/qemu-dm'

disk = ['file:/var/ovs/mount/93B14928C7A6438284753B2F2AB197BB/seed_pool/vm_temp/System.img,hda,w',

'file:/OVS/iso_pool/winxpsp2/WXPVOL_EN.iso,hdc:cdrom,r',

]

kernel = '/usr/lib/xen/boot/hvmloader'

memory = '300'

name = 'vm_temp'

on_crash = 'restart'

on_reboot = 'restart'

pae = 1

serial = 'pty'

timer_mode = '0'

usbdevice = 'tablet'

uuid = '8569c556-fdf9-41f7-93f4-52350560b13c'

vcpus = 1

vif = ['bridge=xenbr0,mac=00:16:3E:64:FB:D3,type=ioemu']

vif_other_config = []

vnc = 1

vncconsole = 1

vnclisten = '0.0.0.0'

vncpasswd = 'oracle'

vncunused = 1

Code:

[root@OVM-SERVER1 vm_temp]# sed "s/^name/name = newvalue/g" vm.cfg

Above code produces following output.

Code:

[root@OVM-SERVER1 vm_temp]# sed "s/^name/name = newvalue/g" vm.cfg

acpi = 1

apic = 1

builder = 'hvm'

device_model = '/usr/lib/xen/bin/qemu-dm'

disk = ['file:/var/ovs/mount/93B14928C7A6438284753B2F2AB197BB/seed_pool/vm_temp/System.img,hda,w',

'file:/OVS/iso_pool/winxpsp2/WXPVOL_EN.iso,hdc:cdrom,r',

]

kernel = '/usr/lib/xen/boot/hvmloader'

memory = '300'

name = newvalue = 'vm_temp'

on_crash = 'restart'

on_reboot = 'restart'

pae = 1

serial = 'pty'

timer_mode = '0'

usbdevice = 'tablet'

uuid = '8569c556-fdf9-41f7-93f4-52350560b13c'

vcpus = 1

vif = ['bridge=xenbr0,mac=00:16:3E:64:FB:D3,type=ioemu']

vif_other_config = []

vnc = 1

vncconsole = 1

vnclisten = '0.0.0.0'

vncpasswd = 'oracle'

vncunused = 1

please help.

yes, the bug is you are not searching any characters after 'name'.
As you can see, there is a space...which is a character..