The seven standard Unix file types are regular, directory, symbolic link, FIFO special, block special, character special, and socket as defined by POSIX.[1] Different OS-specific implementations allow more types than what POSIX requires (e.g. Solaris doors). A file's type can be identified by the ls -l
command, which displays the type in the first character of the file-system permissions field.
For regular files, Unix does not impose or provide any internal file structure; therefore, their structure and interpretation is entirely dependent on the software using them.[2] However, the file
command can usually be used to determine what type of data they contain.[3]
A file is nothing more than a stream of bytes ...
file
". IEEE Std 1003.1-2017 (POSIX). The Open Group. 2018. Archived from the original on 2018-10-12. Retrieved 2023-10-26.
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