grub using sed

Asked Apr 07 '17 at 14:27

Active Apr 07 '17 at 14:27

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I want to add commands to the file /etc/default/grub by using sed.

REPLACE="intel_idle.max_cstate=0 isolcpus=2,4,6,8,10,12,14,16,18,20,22     nohz_full=2,4,6,8,10,12,14,16,18,20,22 rcu_nocbs=2,4,6,8,10,12,14,16,18,20,22"

sed -i 's/[A-Za-z0-9]*GRUB_CMDLINE_LINUX=[A-Za-z0-9]*/ $REPLACE/g'   /etc/default/grub

But it does not work. Any ideas ?¨

asked Apr 07 '17 at 14:27

Michael Granath

Single quotes prevent parameter expansion. – Benjamin W. Apr 07 '17 at 14:53
Possible duplicate of [sed substitution with bash variables](http://stackoverflow.com/questions/7680504/sed-substitution-with-bash-variables) – Benjamin W. Apr 07 '17 at 14:53

Adding Isolate CPU Cores in /etc/default/grub using sed

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