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Different command-line argument parsing methods are used by different programming languages to parse command-line arguments. ... use std:: env; fn main {let args: ...
env is a shell command for Unix and Unix-like operating systems. 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.
Alternatively, from command shells such as bash, a user can change environment variables for a particular command invocation by indirectly invoking it via env or using the ENVIRONMENT_VARIABLE=VALUE <command> notation. A running program can access the values of environment variables for configuration purposes.
Convert spaces to tabs 3BSD unget: SCCS Optional (XSI) Undo a previous get of an SCCS file System III uniq: Text processing Mandatory Report or filter out repeated lines in a file Version 3 AT&T UNIX unlink: Filesystem Optional (XSI) Call the unlink function Version 1 AT&T UNIX uucp: Network Optional (UU) System-to-system copy Version 7 AT&T ...
echo — Write each argument to stdout, with one space between each, followed by a newline. egrep — Show lines matching extended regular expressions. eject — Eject DEVICE or default /dev/cdrom. env — Set the environment for command invocation, or list environment variables. expand — Expand tabs to spaces according to tabstops.
After this, each invocation of the va_arg macro yields the next argument. The first argument to va_arg is the va_list and the second is the type of the next argument passed to the function. As the last step, the va_end macro must be called on the va_list before the function returns.
Image source: Getty Images. Early claiming comes at a cost. The Social Security Administration assigns everyone a full retirement age (FRA) based on their birth year. It's 67 for most workers ...
dd is a command-line utility for Unix, Plan 9, Inferno, and Unix-like operating systems and beyond, the primary purpose of which is to convert and copy files. [1] On Unix, device drivers for hardware (such as hard disk drives) and special device files (such as /dev/zero and /dev/random) appear in the file system just like normal files; dd can also read and/or write from/to these files ...