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Formatting Help needed

 
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Top Forums UNIX for Dummies Questions & Answers Formatting Help needed
# 1  
Old 06-14-2010
Formatting Help needed
How would i write a script which will add a following content to a file.

File Before running script.
Code:
acpi = 1
apic = 1
builder = 'hvm'
device_model = '/usr/lib/xen/bin/qemu-dm'
disk = ['file:/var/ovs/mount/825D2FF7ED2645428AD5AED714B5E777/running_pool/IFLMUD5IM0196/System-hdc.img,hda,w',
',hdc:cdrom,r',
]

File After running the script.

Code:
acpi = 1
apic = 1
builder = 'hvm'
device_model = '/usr/lib/xen/bin/qemu-dm'
disk =  ['file:/var/ovs/mount/825D2FF7ED2645428AD5AED714B5E777/running_pool/IFLMUD5IM0196/System-hdc.img,hda,w',
'file:/var/ovs/mount/825D2FF7ED2645428AD5AED714B5E777/iso_pool/WindowXP/XpBoot.iso,hdc:cdrom,r',
]

Here i have added file:/var/ovs/mount/825D2FF7ED2645428AD5AED714B5E777/iso_pool/WindowXP/XpBoot.iso
file.

There fore if i want to rerun the script with another value it should remove the previous entry and enter the new entry.
as below.

File Before running script.

Code:
acpi = 1
 apic = 1
 builder = 'hvm'
 device_model = '/usr/lib/xen/bin/qemu-dm'
 disk =  ['file:/var/ovs/mount/825D2FF7ED2645428AD5AED714B5E777/running_pool/IFLMUD5IM0196/System-hdc.img,hda,w',
 'file:/var/ovs/mount/825D2FF7ED2645428AD5AED714B5E777/iso_pool/WindowXP/XpBoot.iso,hdc:cdrom,r',
 ]

File After running the script.

Code:
acpi = 1
 apic = 1
 builder = 'hvm'
 device_model = '/usr/lib/xen/bin/qemu-dm'
 disk =  ['file:/var/ovs/mount/825D2FF7ED2645428AD5AED714B5E777/running_pool/IFLMUD5IM0196/System-hdc.img,hda,w',
 'file:/var/ovs/mount/825D2FF7ED2645428AD5AED714B5E777/iso_pool/Window2003/2k3.iso,hdc:cdrom,r',
 ]

Being a new to unix scripting this task is a big challenge for me and i could not able to solve it.
therefore seeking your help here.
# 2  
Old 06-14-2010
Code:
# cat ol
acpi = 1
 apic = 1
 builder = 'hvm'
 device_model = '/usr/lib/xen/bin/qemu-dm'
 disk =  ['file:/var/ovs/mount/825D2FF7ED2645428AD5AED714B5E777/running_pool/IFLMUD5IM0196/System-hdc.img,hda,w',
 'file:/var/ovs/mount/825D2FF7ED2645428AD5AED714B5E777/iso_pool/WindowXP/XpBoot.iso,hdc:cdrom,r',
 ]


Code:
# sed 's:iso_pool/WindowXP/XpBoot.iso:iso_pool/Window2003/2k3.iso:' file 
 acpi = 1
 apic = 1
 builder = 'hvm'
 device_model = '/usr/lib/xen/bin/qemu-dm'
 disk =  ['file:/var/ovs/mount/825D2FF7ED2645428AD5AED714B5E777/running_pool/IFLMUD5IM0196/System-hdc.img,hda,w',
 'file:/var/ovs/mount/825D2FF7ED2645428AD5AED714B5E777/iso_pool/Window2003/2k3.iso,hdc:cdrom,r',
 ]

# 3  
Old 06-14-2010
Quote:
Originally Posted by ygemici
Code:
# cat ol
acpi = 1
 apic = 1
 builder = 'hvm'
 device_model = '/usr/lib/xen/bin/qemu-dm'
 disk =  ['file:/var/ovs/mount/825D2FF7ED2645428AD5AED714B5E777/running_pool/IFLMUD5IM0196/System-hdc.img,hda,w',
 'file:/var/ovs/mount/825D2FF7ED2645428AD5AED714B5E777/iso_pool/WindowXP/XpBoot.iso,hdc:cdrom,r',
 ]

Code:
# sed 's:iso_pool/WindowXP/XpBoot.iso:iso_pool/Window2003/2k3.iso:' file 
 acpi = 1
 apic = 1
 builder = 'hvm'
 device_model = '/usr/lib/xen/bin/qemu-dm'
 disk =  ['file:/var/ovs/mount/825D2FF7ED2645428AD5AED714B5E777/running_pool/IFLMUD5IM0196/System-hdc.img,hda,w',
 'file:/var/ovs/mount/825D2FF7ED2645428AD5AED714B5E777/iso_pool/Window2003/2k3.iso,hdc:cdrom,r',
 ]

The problem with above code is you never know what is the previous is0 entry .
For example you have written script considering the previous entries (/WindowXP/XpBoot.iso,hdc). It can be anything But it will have an .iso in the end that is sure.
# 4  
Old 06-14-2010
Quote:
Originally Posted by pinga123
The problem with above code is you never know what is the previous is0 entry .
For example you have written script considering the previous entries (/WindowXP/XpBoot.iso,hdc). It can be anything But it will have an .iso in the end that is sure.
Code:
# cat myfile
acpi = 1
 apic = 1
 builder = 'hvm'
 device_model = '/usr/lib/xen/bin/qemu-dm'
 disk =  ['file:/var/ovs/mount/825D2FF7ED2645428AD5AED714B5E777/running_pool/IFLMUD5IM0196/System-hdc.img,hda,w',
 'file:/var/ovs/mount/825D2FF7ED2645428AD5AED714B5E777/iso_pool/WindowXP/XpBoot.iso,hdc:cdrom,r',
 ]


we let take line which change line
Code:
 
previous=$( (sed -n "/\(file:.*,hdc:cdrom,r'\)/p" myfile) )

nextline is must be your new line so you input what you want this Smilie
Code:
 
next="file:/var/ovs/mount/825D2FF7ED2645428AD5AED714B5E777/iso_pool/Window2003/XpBoot.iso"

and you can use change line one time
Code:
 
sed -e "s|$previous| '$next,hdc:cdrom,r'|" myfile
 
acpi = 1
 apic = 1
 builder = 'hvm'
 device_model = '/usr/lib/xen/bin/qemu-dm'
 disk =  ['file:/var/ovs/mount/825D2FF7ED2645428AD5AED714B5E777/running_pool/IFLMUD5IM0196/System-hdc.img,hda,w',
 'file:/var/ovs/mount/825D2FF7ED2645428AD5AED714B5E777/iso_pool/Window2003/XpBoot.iso,hdc:cdrom,r'
 ]

# 5  
Old 06-15-2010
Quote:
Originally Posted by ygemici
Code:
# cat myfile
acpi = 1
 apic = 1
 builder = 'hvm'
 device_model = '/usr/lib/xen/bin/qemu-dm'
 disk =  ['file:/var/ovs/mount/825D2FF7ED2645428AD5AED714B5E777/running_pool/IFLMUD5IM0196/System-hdc.img,hda,w',
 'file:/var/ovs/mount/825D2FF7ED2645428AD5AED714B5E777/iso_pool/WindowXP/XpBoot.iso,hdc:cdrom,r',
 ]

we let take line which change line
Code:
 
previous=$( (sed -n "/\(file:.*,hdc:cdrom,r'\)/p" myfile) )

nextline is must be your new line so you input what you want this Smilie
Code:
 
next="file:/var/ovs/mount/825D2FF7ED2645428AD5AED714B5E777/iso_pool/Window2003/XpBoot.iso"

and you can use change line one time
Code:
 
sed -e "s|$previous| '$next,hdc:cdrom,r'|" myfile
 
acpi = 1
 apic = 1
 builder = 'hvm'
 device_model = '/usr/lib/xen/bin/qemu-dm'
 disk =  ['file:/var/ovs/mount/825D2FF7ED2645428AD5AED714B5E777/running_pool/IFLMUD5IM0196/System-hdc.img,hda,w',
 'file:/var/ovs/mount/825D2FF7ED2645428AD5AED714B5E777/iso_pool/Window2003/XpBoot.iso,hdc:cdrom,r'
 ]

Even this script has its own disadvantage as it is unable to replace the previous entry which is null.
For example.This script will fail if previous entry is like following.

Code:
acpi = 1
 apic = 1
 builder = 'hvm'
 device_model = '/usr/lib/xen/bin/qemu-dm'
 disk =   ['file:/var/ovs/mount/825D2FF7ED2645428AD5AED714B5E777/running_pool/IFLMUD5IM0196/System-hdc.img,hda,w',
 ',hdc:cdrom,r'

# 6  
Old 06-23-2010
Please suggest
 
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