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Shell Programming and Scripting

add or modify if existent

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# 1  
Old 03-27-2007
add or modify if existent
I want to set these params in /etc/system

set shmsys:shminfo_shmmax=2000000000
set shmseg:shminfo_shmseg=200


if this param exists, then I want to modify them
if not, I want to add them.

I can add them using >>/etc/system
but how to do the modify thing?
at least I can comment the existing lines -if existent- and then add the 2 entries.
# 2  
Old 03-27-2007
Code:
sed -e "s/.*shmsys:shminfo_shmmax.*/set shmsys:shminfo_shmmax=2000000000/" -e "s/.*shmseg:shminfo_shmseg.*/set shmseg:shminfo_shmseg=200/" /etc/system > tmp
mv tmp /etc/system

# 3  
Old 03-27-2007
thanks. this is modiying but not adding in case the entry does not exist.
can you please advise?
# 4  
Old 03-27-2007
Code:
awk -F"[ =]" '
BEGIN { arr["shmsys:shminfo_shmmax"]="set shmsys:shminfo_shmmax= 2000000000";
arr["shmseg:shminfo_shmseg"]="set shmseg:shminfo_shmseg=200"; }
{ if( arr[$2] !~ /^ *$/ ) { print arr[$2]; delete arr[$2]; }
  else print }
END {
for( key in arr ) {
	if( arr[key] !~ /^ *$/ ) { print arr[key] }
} } ' /etc/system > tmp
mv tmp /etc/system

# 5  
Old 03-28-2007
Quote:
Originally Posted by melanie_pfefer
I want to set these params in /etc/system

set shmsys:shminfo_shmmax=2000000000
set shmseg:shminfo_shmseg=200


if this param exists, then I want to modify them
if not, I want to add them.

I can add them using >>/etc/system
but how to do the modify thing?
at least I can comment the existing lines -if existent- and then add the 2 entries.
Code:
cat<<! >tmp && mv tmp /etc/system
$(egrep -v "^set (shmsys:shminfo_shmmax|shmseg:shminfo_shmseg)" /etc/system)
$(printf "set shmsys:%s\nset shmseg:%s\n" "shminfo_shmmax=2000000000" "shminfo_shmseg=200")
!

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