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It is used to either print a list of environment variables or run another utility in an altered environment without having to modify the currently existing environment. Using env, variables may be added or removed, and existing variables may be changed by assigning new values to them. In practice, env has another common use. It is often used by ...
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.
The SET command without any arguments displays all environment variables along with their values; SET " ", zero or more spaces, will include internal variables too. In CMD.EXE , it is possible to assign local variables that will not be global using the SETLOCAL command and ENDLOCAL to restore the environment.
It is developed for the Debian Linux distribution, and is closely integrated with Debian's package management system, dpkg. When packages are being installed, debconf asks the user questions which determine the contents of the system-wide configuration files associated with that package.
A sophisticated shell can also change the environment in which other programs execute by passing named variables, a parameter list, or an input source. In Unix-like operating systems, users typically have many choices of command-line interpreters for interactive sessions.
Set the SOURCE_DATE_EPOCH environment variable to the number of seconds since January 1, 1970, using something from the source code. Tools that support this environment variable will use its value (when set) instead of the current date and time. Post-process output to remove timestamps or normalize them.
The C shell implements both shell and environment variables. [14] Environment variables, created using the setenv statement, are always simple strings, passed to any child processes, which retrieve these variables via the envp[] argument to main(). Shell variables, created using the set or @ statements, are internal to C shell. They are not ...
The Environment Modules system is a tool to help users manage their Unix or Linux shell environment, by allowing groups of related environment-variable settings to be made or removed dynamically. Modules has been around since the early 1990s [ 1 ] and is used at some of the largest computer centers [ 2 ] to deploy multiple versions of different ...