## `PATH` 환경 변수

**`PATH`**라고 불리는, **특별한** 환경변수가 있습니다. 운영체제(Linux, Windows, macOS 등)에서 실행할 프로그램을 찾기위해 사용됩니다.

변수 `PATH`의 값은 Linux와 macOS에서는 콜론 `:`, Windows에서는 세미콜론 `;`으로 구분된 디렉토리로 구성된 긴 문자열입니다.

예를 들어, `PATH` 환경 변수는 다음과 같습니다:

//// tab | Linux, macOS

```plaintext
/usr/local/bin:/usr/bin:/bin:/usr/sbin:/sbin

from typing import Annotated

from fastapi import FastAPI, Path

app = FastAPI()


@app.get("/items/{item_id}")
async def read_items(
    item_id: Annotated[int, Path(title="The ID of the item to get", gt=0, le=1000)],
    q: str,
):
    results = {"item_id": item_id}
    if q:
        results.update({"q": q})

		return -1, &os.PathError{Op: "open", Path: name, Err: e}
	}
	return fd, nil
}

// Forked from Golang but chooses to avoid performing lookup
//
// osMkdirAll creates a directory named path,
// along with any necessary parents, and returns nil,
// or else returns an error.
// The permission bits perm (before umask) are used for all
// directories that MkdirAll creates.
// If path is already a directory, MkdirAll does nothing

from fastapi import FastAPI, Path

app = FastAPI()


@app.get("/items/{item_id}")
async def read_items(
    *,
    item_id: int = Path(title="The ID of the item to get", gt=0, le=1000),
    q: str,
):
    results = {"item_id": item_id}
    if q:
        results.update({"q": q})

from typing import Union

from fastapi import FastAPI, Path, Query

app = FastAPI()


@app.get("/items/{item_id}")
async def read_items(
    item_id: int = Path(title="The ID of the item to get"),
    q: Union[str, None] = Query(default=None, alias="item-query"),
):
    results = {"item_id": item_id}
    if q:
        results.update({"q": q})

// along with this program.  If not, see <http://www.gnu.org/licenses/>.

package dns

import (
	"path"
	"strings"

	"github.com/miekg/dns"
)

// msgPath converts a domainname to an etcd path. If s looks like service.staging.skydns.local.,
// the resulting key will be /skydns/local/skydns/staging/service .
func msgPath(s, prefix string) string {

	./all.bash

To run tests on the Android device, add the bin directory to PATH so the
go tool can find the go_android_$GOARCH_exec wrapper generated by
make.bash. For example, to run the go1 benchmarks

	export PATH=$GOROOT/bin:$PATH
	cd $GOROOT/test/bench/go1/

* host (in a podcast): host
* request (as in HTTP request): request
* response (as in HTTP response): response
* path operation function: path operation function (do not translate to "función de operación de ruta")
* path operation: path operation (do not translate to "operación de ruta")
* path (as in URL path): path (do not translate to "ruta")
* query (as in URL query): query (do not translate to "consulta")
* cookie (as in HTTP cookie): cookie

    public void testRepositoryLeakageBetweenSiblings() throws Exception {
        // Create a temporary directory structure for our test
        Path tempDir = Files.createTempDirectory("maven-repo-leakage-test");

        try {
            // Create parent POM
            Path parentPom = tempDir.resolve("pom.xml");
            Files.writeString(parentPom, """
                <?xml version="1.0" encoding="UTF-8"?>

		b.ResetTimer()
		b.ReportAllocs()

		for b.Loop() {
			pathJoinOld("volume", "path/path/path")
		}
	})
}

func BenchmarkPathJoin(b *testing.B) {
	b.Run("PathJoin", func(b *testing.B) {
		b.ResetTimer()
		b.ReportAllocs()

		for b.Loop() {
			pathJoin("volume", "path/path/path")
		}
	})
}

// Wrapper
func TestPathTraversalExploit(t *testing.T) {