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Each REXX has it's own documentation, and viewing it would depend on the host environment.
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=={{header|Rust}}==
The Rust compiler's help screen:
<pre>
$ rustc --help
Usage: rustc [OPTIONS] INPUT
Options:
-h, --help Display this message
--cfg SPEC Configure the compilation environment
-L [KIND=]PATH Add a directory to the library search path. The
optional KIND can be one of dependency, crate, native,
framework, or all (the default).
-l [KIND=]NAME Link the generated crate(s) to the specified native
library NAME. The optional KIND can be one of
static, framework, or dylib (the default).
--crate-type [bin|lib|rlib|dylib|cdylib|staticlib|proc-macro]
Comma separated list of types of crates
for the compiler to emit
--crate-name NAME
Specify the name of the crate being built
--edition 2015|2018
Specify which edition of the compiler to use when
compiling code.
--emit [asm|llvm-bc|llvm-ir|obj|metadata|link|dep-info|mir]
Comma separated list of types of output for the
compiler to emit
--print [crate-name|file-names|sysroot|cfg|target-list|target-cpus|target-features|relocation-models|code-models|tls-models|target-spec-json|native-static-libs]
Compiler information to print on stdout
-g Equivalent to -C debuginfo=2
-O Equivalent to -C opt-level=2
-o FILENAME Write output to <filename>
--out-dir DIR Write output to compiler-chosen filename in <dir>
--explain OPT Provide a detailed explanation of an error message
--test Build a test harness
--target TARGET Target triple for which the code is compiled
-W, --warn OPT Set lint warnings
-A, --allow OPT Set lint allowed
-D, --deny OPT Set lint denied
-F, --forbid OPT Set lint forbidden
--cap-lints LEVEL
Set the most restrictive lint level. More restrictive
lints are capped at this level
-C, --codegen OPT[=VALUE]
Set a codegen option
-V, --version Print version info and exit
-v, --verbose Use verbose output
Additional help:
-C help Print codegen options
-W help Print 'lint' options and default settings
-Z help Print unstable compiler options
--help -v Print the full set of options rustc accepts
</pre>
Cargo's help screen:
<pre>
$ cargo --help
Rust's package manager
USAGE:
cargo [OPTIONS] [SUBCOMMAND]
OPTIONS:
-V, --version Print version info and exit
--list List installed commands
--explain <CODE> Run `rustc --explain CODE`
-v, --verbose Use verbose output (-vv very verbose/build.rs output)
-q, --quiet No output printed to stdout
--color <WHEN> Coloring: auto, always, never
--frozen Require Cargo.lock and cache are up to date
--locked Require Cargo.lock is up to date
--offline Run without accessing the network
-Z <FLAG>... Unstable (nightly-only) flags to Cargo, see 'cargo -Z help' for details
-h, --help Prints help information
Some common cargo commands are (see all commands with --list):
build Compile the current package
check Analyze the current package and report errors, but don't build object files
clean Remove the target directory
doc Build this package's and its dependencies' documentation
new Create a new cargo package
init Create a new cargo package in an existing directory
run Run a binary or example of the local package
test Run the tests
bench Run the benchmarks
update Update dependencies listed in Cargo.lock
search Search registry for crates
publish Package and upload this package to the registry
install Install a Rust binary. Default location is $HOME/.cargo/bin
uninstall Uninstall a Rust binary
See 'cargo help <command>' for more information on a specific command.
</pre>
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