+akiva@akiva-ThinkPad-X230:~$ sudo fallocate -l 4G /tmp/swapfile; mkswap /tmp/swapfile; swapon /tmp/swapfile
[sudo] password for akiva: 
mkswap: /tmp/swapfile: insecure permissions 0644, 0600 suggested.
mkswap: /tmp/swapfile: warning: wiping old swap signature.
Setting up swapspace version 1, size = 4 GiB (4294963200 bytes)
no label, UUID=b1b647ce-164f-4ef0-8afd-07bfaa17fccb
swapon: /tmp/swapfile: insecure permissions 0644, 0600 suggested.
swapon: /tmp/swapfile: insecure file owner 1000, 0 (root) suggested.
swapon: /tmp/swapfile: swapon failed: Operation not permitted
+akiva@akiva-ThinkPad-X230:~$