I installed linux and forgot to create a swap space partition
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Yes, it is possible to use a file as swap space just like windows but it will not be as fast as a swap partition. If you have free space you can resize an existing partiton and then create a swap partition.
Here is an example for a swap file:
dd if=/dev/zero of=/usr/local/newswap bs=1000000 count=20 (20mb swap file)
chmod 600 /usr/local/newswap
Then add this line to your /etc/fstab
/usr/local/newswap swap swap defaults 0 0
BTW you can change the location of the swap file.
If you create a swap partition the steps will be
And the fstab
/dev/hdxy swap swap defaults 0 0