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mktemp is a command available in many Unix-like operating systems that creates a temporary file or directory. [1] Originally released in 1997 as part of OpenBSD 2.1, [2] a separate implementation exists as a part of GNU Coreutils. [3] There used to be a similar named C library function, which is now deprecated for being unsafe, and has safer ...
Programs that explicitly check the type of a file before opening it may refuse to work with process substitution, because the "file" resulting from process substitution is not a regular file. Additionally, up to Bash 4.4 (released September 2016), it was not possible to obtain the exit code of a process substitution command from the shell that ...
After mkstemp was added to the Single UNIX Specification, the function tmpnam() was deprecated, [1] because the latter carried the risk that a temporary file with the same name could be created by another thread or process within the time from when the caller obtains the temporary filename and attempts to create it.
In Unix and Linux, the global temporary directories are /tmp and /var/tmp. Web browsers periodically write data to the tmp directory during page views and downloads. Typically, /var/tmp is for persistent files (as it may be preserved over reboots), and /tmp is for more temporary files. See Filesystem Hierarchy Standard.
TMPDIR is the canonical environment variable in Unix and POSIX [1] that should be used to specify a temporary directory for scratch space.Most Unix programs will honor this setting and use its value to denote the scratch area for temporary files instead of the common default of /tmp [2] [3] or /var/tmp.
A temporary file is a file created to store information temporarily, either for a program's intermediate use or for transfer to a permanent file when complete. [1] It may be created by computer programs for a variety of purposes, such as when a program cannot allocate enough memory for its tasks, when the program is working on data bigger than the architecture's address space, or as a ...
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They can also be used to store temporary values for reference later in a shell script. However, in Unix, non-exported variables are preferred for this as they do not leak outside the process. In Unix, an environment variable that is changed in a script or compiled program will only affect that process and possibly child processes.