asked on need help in fixing below script
Hi All
I want to incraese swap as per ram size so created one script.
but it gives some error - please help me to fix it.
I want to incraese swap as per ram size so created one script.
but it gives some error - please help me to fix it.
#!/bin/sh
oram=/usr/bin/free -g | grep Mem | awk '{print $2}'
swap.sh: line 3: -g: command not found
oswap=/usr/bin/free -g | grep Swap | awk '{print $2}'
swap.sh: line 4: -g: command not found
if [ "$oram" < 2 ]
then
swapsize=$oram*1.5
elif [ "$oram" >= 2 && "$oram" <= 16 ]
then
swapsize=$oram
if [ "$oram" > 16 ]
then
swapsize=16
fi
# does the swap file already exist?
grep -q "swapfile" /etc/fstab
# if not then create it
if [ $? -ne 0 ]; then
echo 'swapfile not found. Adding swapfile.'
fallocate -l ${swapsize}G /swapfile
chmod 600 /swapfile
mkswap /swapfile
swapon /swapfile
echo '/swapfile none swap defaults 0 0' >> /etc/fstab
else
echo 'swapfile found. No changes made.'
fi
# output results to terminal
cat /proc/swaps
cat /proc/meminfo | grep Swap
LinuxScripting LanguagesShell Scripting
Last Comment
Gerwin Jansen
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ASKER
Thanks but now if statement not working
oram=$(/usr/bin/free -g | grep Mem | awk '{print $2}')
oswap=$(/usr/bin/free -g | grep Swap | awk '{print $2}')
echo "Current Ram = $oram "
echo "Current Swap = $oswap "
if [ "$oram" < 2 ]
then
swapsize=($oram*1.5)
echo "$swapsize"
elif [ "$oram" >= 2 && "$oram" <= 16 ]
then
swapsize=$oram
echo "$swapsize"
elif [ "$oram" > 16 ]
then
swapsize=16
echo "$swapsize"
fi
oram=$(/usr/bin/free -g | grep Mem | awk '{print $2}')
oswap=$(/usr/bin/free -g | grep Swap | awk '{print $2}')
echo "Current Ram = $oram "
echo "Current Swap = $oswap "
if [ "$oram" < 2 ]
then
swapsize=($oram*1.5)
echo "$swapsize"
elif [ "$oram" >= 2 && "$oram" <= 16 ]
then
swapsize=$oram
echo "$swapsize"
elif [ "$oram" > 16 ]
then
swapsize=16
echo "$swapsize"
fi
see comment from Gerwin above you need to exchange the comparision operators accordingly.
ASKER
yeah it works thanks one last thing any idea on swapsize=($oram*1.5) its not working well :(
use bc for that "swapsize=($oram*1.5)" - like:
swapsize=$(echo "${oram}*1.5" | bc)
swapsize=$(echo "${oram}*1.5" | bc)
ASKER CERTIFIED SOLUTION
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@gerwin thank for bc, didnt know that :)
ASKER
Yup great but uts giving me in decimal i need to round off it
Current Ram = 2006
Current Swap = 1023
New Swap Size = 3009.0
Current Ram = 2006
Current Swap = 1023
New Swap Size = 3009.0
round down using bc again:
swapsize=$(echo "${oram}*1.5/1" | bc)
swapsize=$(echo "${oram}*1.5/1" | bc)
>> Current Ram = 2006
You have 2006 G of ram? You specified "free -g" above which should give you "2" instead of "2006".
You have 2006 G of ram? You specified "free -g" above which should give you "2" instead of "2006".
ASKER
Thank you so much Andreas and Grewin for quick help. :)
You're welcome ;)
I don't care about points but you should have selected the first comment as an (assisted) solution as well because that got you the mem/swap values into variables.
I don't care about points but you should have selected the first comment as an (assisted) solution as well because that got you the mem/swap values into variables.
oram=/usr/bin/free -g | grep Mem | awk '{print $2}'
into
oram=$(/usr/bin/free -g | grep Mem | awk '{print $2}') and it should work
Same mod with the oswap line.