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Old 11-05-2009, 03:38 AM   #1
pinga123
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Registered: Sep 2009
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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.
 
Old 11-05-2009, 03:40 AM   #2
Agrouf
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Registered: Sep 2005
Location: France
Distribution: LFS
Posts: 1,591

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Code:
sed "s/^name =.*$/name = newvalue/g" vm.cfg
 
Old 11-05-2009, 03:46 AM   #3
centosboy
Senior Member
 
Registered: May 2009
Location: london
Distribution: centos5
Posts: 1,137

Rep: Reputation: 116Reputation: 116
Quote:
Originally Posted by pinga123 View Post
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.


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


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