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Old 01-28-2010, 05:34 PM   #1
replica88
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Registered: Nov 2009
Posts: 48

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insert text to a file using command line


I need to be able to edit a file from the commend line as I intend to script this operation, the file is called menu.lst

The original is as below

Code:
title		Ubuntu 8.04.3 LTS, kernel 2.6.24-24-generic
root		(hd0,0)
kernel		/boot/vmlinuz-2.6.24-24-generic root=UUID=b09feb23-5524-4ec4-862f-94700b968f64 ro quiet splash
initrd		/boot/initrd.img-2.6.24-24-generic
quiet

title		Ubuntu 8.04.3 LTS, kernel 2.6.24-24-generic (recovery mode)
root		(hd0,0)
kernel		/boot/vmlinuz-2.6.24-24-generic root=UUID=b09feb23-5524-4ec4-862f-94700b968f64 ro single
initrd		/boot/initrd.img-2.6.24-24-generic

title		Ubuntu 8.04.3 LTS, memtest86+
root		(hd0,0)
kernel		/boot/memtest86+.bin
quiet
I need to add acpi=force to two lines as below

Code:
title		Ubuntu 8.04.3 LTS, kernel 2.6.24-24-generic
root		(hd0,0)
kernel		/boot/vmlinuz-2.6.24-24-generic root=UUID=b09feb23-5524-4ec4-862f-94700b968f64 ro quiet splash acpi=force
initrd		/boot/initrd.img-2.6.24-24-generic
quiet

title		Ubuntu 8.04.3 LTS, kernel 2.6.24-24-generic (recovery mode)
root		(hd0,0)
kernel		/boot/vmlinuz-2.6.24-24-generic root=UUID=b09feb23-5524-4ec4-862f-94700b968f64 ro single acpi=force
initrd		/boot/initrd.img-2.6.24-24-generic

title		Ubuntu 8.04.3 LTS, memtest86+
root		(hd0,0)
kernel		/boot/memtest86+.bin
quiet
Any ideas?
 
Old 01-28-2010, 05:45 PM   #2
pixellany
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Code:
sed -i '/^kernel/s/$/ acpi=force/' menu.lst
Test it first without the "-i" flag
 
Old 01-28-2010, 05:49 PM   #3
colucix
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Registered: Sep 2003
Location: Bologna
Distribution: CentOS 6.5 OpenSuSE 12.3
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The most straightforward method to edit a file using a command is by means of the sed editor. If you're already familiar with it, take in mind you can edit the file in place using the option -i. But always do a backup copy of your original file, until you're sure the result is exactly as your expectations. sed permits to do this automatically, just by adding a suffix to the option -i, e.g.
Code:
sed -i.bck <sed command here> file
will create a backup copy named file.bck, before editing file. Maybe you already know all of this, but it's worth to mention for safety.

Regarding your question, using sed you can just address the lines containing the keyword "kernel" at the beginning and add " acpi=force" at the end. For example:
Code:
sed '/^kernel/ s/$/ apci=force/' menu.lst
Don't forget the space before "apci".

Edit: too late... sorry for redundancy. Pixellany, I envy your ability to be clear and succinct...

Last edited by colucix; 01-28-2010 at 05:53 PM.
 
Old 01-28-2010, 06:25 PM   #4
Tinkster
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Slight modification
Code:
sed -i '/^kernel		\/boot\/vmlinuz/s/$/ acpi=force/' menu.lst

Because i don't know whether memtest will handle the acpi=force

Last edited by Tinkster; 01-28-2010 at 06:29 PM.
 
Old 01-28-2010, 06:50 PM   #5
colucix
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Quote:
Originally Posted by Tinkster View Post
Because i don't know whether memtest will handle the acpi=force
He he.. that's right!
 
  


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