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What is the command cp used for?
cp stands for copy. This command is used to copy files or group of files or directory. It creates an exact image of a file on a disk with different file name.
What are the options of cp command?
cp command options
| option | description |
|---|---|
| cp -n | no file overwrite |
| cp -R | recursive copy (including hidden files) |
| cp -u | update – copy when source is newer than dest |
| cp -v | verbose – print informative messages |
Which is a block device?
A block device is a computer data storage device that supports reading and (optionally) writing data in fixed-size blocks, sectors, or clusters. These blocks are generally 512 bytes or a multiple thereof in size.
What is difference between copy and xcopy command?
Copies one or more than one files to another location. Quoting from the result of xcopy /? Copies files and directory trees. The essential difference between the two commands is that when you provide the path of a folder to copy , only the files in that folder will be copied to the specified destination.
Which is an example of a block device mapping?
Instance store volumes (virtual devices whose underlying hardware is physically attached to the host computer for the instance) A block device mapping defines the block devices (instance store volumes and EBS volumes) to attach to an instance.
What are the arguments for the dd command?
The basic use of the dd command is rather easy because it takes just two arguments: if = to specify the input file and of = to specify the output file. The arguments to those options can be either files or block devices. I would, however, not recommend using dd to copy files because cp does that in a much simpler way.
What happens when a block device is detached from an instance?
After a block device is attached to an instance, it must be mounted by the operating system before you can access the storage device. When a block device is detached from an instance, it is unmounted by the operating system and you can no longer access the storage device.
When to ignore instance store volumes in Block Device Mapping?
For M3 instances, you must specify instance store volumes in the block device mapping for the instance when you launch it. When you launch an M3 instance, instance store volumes specified in the block device mapping for the AMI may be ignored if they are not specified as part of the instance block device mapping.