AWS cli: rework EBS volume on AMI launch: switch to SSD, "delete on termination" to true

aws
    ec2
        run-instances
            --image-id
                ami-aaaaaa
            --instance-type
                hi1.4xlarge
            --security-group-ids
                sg-eeeeeeee
            --subnet-id
                subnet-cccccccc
            --block-device-mappings
                '[
                    {
                        "DeviceName":"/dev/sdb",
                        "VirtualName":"ephemeral0"
                    },
                    {
                        "DeviceName":"/dev/sdc",
                        "VirtualName":"ephemeral1"
                    },
                    {
                        "DeviceName":"/dev/sdd",
                        "Ebs":
                        {
                            "SnapshotId":"snap-6",
                            "VolumeType":"gp2",
                            "DeleteOnTermination":"true"
                        }
                    }
                ]'
            --region
                us-east-1

Switch to high IOPS

aws
    ec2
        run-instances
            --image-id
                ami-aaaaaa
            --instance-type
                hi1.4xlarge
            --security-group-ids
                sg-eeeeeeee
            --subnet-id
                subnet-cccccccc
            --block-device-mappings
                '[
                    {
                        "DeviceName":"/dev/sdb",
                        "VirtualName":"ephemeral0"
                    },
                    {
                        "DeviceName":"/dev/sdc",
                        "VirtualName":"ephemeral1"
                    },
                    {
                        "DeviceName":"/dev/sdd",
                        "Ebs":
                        {
                            "SnapshotId":"snap-6",
                            "VolumeType":"io1",
                            "Iops":4000,
                            "DeleteOnTermination":"true"
                        }
                    }
                ]'
            --region
                us-east-1

Completely wipe Chrome data on Mac

1. find ~/Library/ -type d -name 'Chrome' -exec rm -rfv {} \;

Out of inodes: file write error (No space left on device)

1. df -hi
1. proves you are out of inodes or not
2. cause is most likely tons of small files in some "problem directory", poke around
2. find <random_dir> -type f | wc -l
1. give a count of file in that subdir
2. common problem dirs
1. /var/spool/<XYZ>
2. /tmp
3. find <problem_dir> -type f -delete
1. deletes one file at a time
2. rm will get stuck finding files first if you use wildcard like *

Recover accidentally deleted file as long as some process still has it open, on Linux

1. lsof | grep myfile
1. the second column is the process id
2. the number in the fourth column is the file descriptor
2. cp /proc/<process id>/fd/<file descriptor> myfile.saved

Taken: http://archive09.linux.com/articles/58142