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where name_of_directory is the name of the directory one wants to create. When typed as above (i.e. normal usage), the new directory would be created within the current directory. On Unix and Windows (with Command extensions enabled, [15] the default [16]), multiple directories can be specified, and mkdir will try to create all of them.
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The C standard library, sometimes referred to as libc, [1] is the standard library for the C programming language, as specified in the ISO C standard. [2] Starting from the original ANSI C standard, it was developed at the same time as the C POSIX library, which is a superset of it. [3]
File URLs are rarely used in Web pages on the public Internet, since they imply that a file exists on the designated host. The host specifier can be used to retrieve a file from an external source, although no specific file-retrieval protocol is specified; and using it should result in a message that informs the user that no mechanism to access ...
The C shell also introduced several notational conveniences (sometimes known as extended globbing), since copied by other Unix shells. abc{def,ghi} is alternation (aka brace expansion) and expands to abcdef abcghi. ~ means the current user's home directory. ~user means user's home directory. Multiple directory-level wildcards, e.g., "*/*.c ...
O_CREAT Create the file if it does not exist; otherwise the open fails setting errno to ENOENT. O_EXCL Used with O_CREAT if the file already exists, then fail, setting errno to EEXIST. O_TRUNC If the file already exists then discard its previous contents, reducing it to an empty file. Not applicable for a device or named pipe.
It is sometimes called the current working directory (CWD), e.g. the BSD getcwd [1] function, or just current directory. [2] When a process refers to a file using a simple file name or relative path (as opposed to a file designated by a full path from a root directory ), the reference is interpreted relative to the working directory of the process.
Creating a copy of a file in the current directory: cp prog.c prog.bak This copies prog.c to prog.bak. If the prog.bak file does not already exist, the cp command creates it. If it does exist, the cp command replaces its contents with the contents of the prog.c file. Copy two files in the current directory into another directory: