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Изворен канал @pythonotes · Post #411 · 9 фев.

reload_flag="" if [[ -n "${DEBUG}" ]]; then reload_flag="--reload" fi if [[ -n "${WORKER_COUNT}" ]]; then workers=${WORKER_COUNT} else workers=2 fi gunicorn --workers ${workers} \ --bind 0.0.0.0:8000 \ ${reload_flag} main.wsgi Писали такие конструкции чтобы проверить наличие флага и сформировать команду правильно? На самом деле можно сделать тоже самое проще. Для этого используются операторы условной подстановки, доступные в оболочках семейства POSIX. :- для установки значений по умолчанию ${WORKER_COUNT:-2} Если переменная не объявлена, то будет дефолтное значение 2. :+ подставляет указанный текст, если переменная не пуста ${DEBUG:+--reload} Если что-то есть в переменной то распечатается текст после символа +, в противном случае - ничего. Удобно для опциональных флагов, как в нашем примере. Итого наш скрипт может выглядеть так: gunicorn --workers ${WORKER_COUNT:-2} \ --bind 0.0.0.0:8000 \ ${DEBUG:+--reload} main.wsgi Есть еще два оператора. := не только подставить дефолтное значение, но и присвоить его переменной, если она пуста # никаких переменных еще нет VAL1=${VAL2:=hello} # теперь доступны обе echo $VAL1 $VAL2 # hello hello :? остановить выполнение с ошибкой, если переменной нет. echo ${MISS:?is required} bash: MISS: is required Код выхода будет 1. #tricks#linux

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Amazing Geography 🌍

@amazingeo · Post #549 · 01.01.2026 г., 12:31

🌍 The Polynesia-Micronesia region is a biodiversity hotspot that covers thousands of remote islands, harboring more than 2,000 unique plant species found nowhere else in the world. ✨ #biodiversity⚡#islands⚡#plants⚡#geography⚡#nature⚡#earth 👉subscribe Amazing Geography 👉more Channels ​

Interesting Planet 🌍

@interesting_planet_facts · Post #371 · 21.07.2025 г., 00:22

🌎 The Amazon rainforest is home to the walking palm tree, which appears to “walk” as it slowly grows new roots to move toward sunlight, gradually shifting its position over years. ✨ #rainforest⚡#plants⚡#adaptation 👉subscribe Interesting Planet

Interesting Planet 🌍

@interesting_planet_facts · Post #370 · 20.07.2025 г., 22:22

🌎 In South America, the giant water lily grows leaves up to 3 meters wide—strong enough to support a small child’s weight! Its waxy surface and ribbed underside help it float, creating floating “rafts” that shelter fish and frogs in warm, shallow waters. ✨ #plants⚡#nature⚡#adaptation 👉subscribe Interesting Planet

Amazing Geography 🌍

@amazingeo · Post #480 · 27.11.2025 г., 20:31

🌍 Some biodiversity hotspots, like the Cape Floristic Region in South Africa, pack over 9,000 plant species into just a tiny area—nearly 70% found nowhere else on Earth. ✨ #biodiversity⚡#plants⚡#hotspots⚡#geography⚡#nature⚡#earth 👉subscribe Amazing Geography 👉more Channels ​

Interesting Planet 🌍

@interesting_planet_facts · Post #1272 · 04.02.2026 г., 12:11

🌎 The corpse flower (Amorphophallus titanum) from Indonesia produces one of the world’s largest and smelliest blooms, reaching over 3 meters tall. The flower emits a strong odor similar to rotting meat, which attracts carrion beetles and flies for pollination. ✨ #plants⚡#botany⚡#biodiversity 👉subscribe Interesting Planet 👉more Channels ​

Interesting Planet 🌍

@interesting_planet_facts · Post #1179 · 31.12.2025 г., 18:11

🌎 The world’s smallest flowering plant, Wolffia globosa, floats on freshwater ponds and is less than 1 millimeter long. A single gram can contain over 150,000 individual plants. ✨ #plants⚡#biodiversity⚡#botany 👉subscribe Interesting Planet 👉more Channels ​

Interesting Planet 🌍

@interesting_planet_facts · Post #912 · 15.10.2025 г., 15:11

🌎 Hidden deep in Western Australia, the rare Kingia australis plant produces tall, grass-like stems crowned with spiky flower heads. Its slow-growing trunk can take up to 150 years to reach just 5 meters, making it one of the region’s botanical oddities. ✨ #plants⚡#botany⚡#biodiversity 👉subscribe Interesting Planet 👉more Channels ​

Interesting Planet 🌍

@interesting_planet_facts · Post #782 · 19.09.2025 г., 18:22

🌎 The Hydnora africana is a rare, parasitic plant native to southern Africa. It grows underground, emerging only to bloom with a fleshy, foul-smelling flower that attracts beetles for pollination. Its flowers can take up to a year to develop under the soil. ✨ #plants⚡#biodiversity⚡#botany 👉subscribe Interesting Planet ​

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