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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
Пребарај: #deserts
@interesting_planet_facts · Post #467 · 30.07.2025 г., 14:22
🌎 In the Namib Desert, the welwitschia plant survives for centuries with just two leaves that grow continuously, curling and splitting but never falling off—a marvel of resilience in extreme heat. ✨ #botany⚡#deserts⚡#adaptation 👉subscribe Interesting Planet
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@amazingeo · Post #499 · 07.12.2025 г., 12:31
🌍 The desert climate zone covers about one-fifth of Earth's land, yet some deserts get colder than snowy regions—Antarctica is classified as the world's largest desert by climate. ✨ #climatezones⚡#deserts⚡#earth⚡#geography⚡#nature 👉subscribe Amazing Geography 👉more Channels
@interesting_planet_facts · Post #688 · 04.09.2025 г., 18:22
🌎 Antarctica is the coldest extreme climate zone, with an average winter temperature of about -60°C. The hottest zone is the Lut Desert in Iran, where ground temperatures have reached 80.8°C, the highest ever recorded on Earth. ✨ #climate⚡#extremes⚡#deserts⚡#antarctica 👉subscribe Interesting Planet
@amazingeo · Post #315 · 30.09.2025 г., 15:31
🌍 The Gobi Desert experiences freezing winters with temperatures dropping below –40°C, making it one of the few deserts known for both scorching heat and extreme cold. ✨ #deserts⚡#climate⚡#extremes⚡#geography⚡#nature⚡#earth 👉subscribe Amazing Geography 👉more Channels
@amazingeo · Post #58 · 16.08.2025 г., 09:12
🌍 Earth holds the record for the highest known surface temperatures for a rocky planet in our Solar System, with some desert spots topping 56°C—hotter than the ground on Venus or Mars. ✨ #planet⚡#deserts⚡#extremes⚡#geography⚡#nature⚡#earth 👉subscribe Amazing Geography🌍
@amazingeo · Post #576 · 14.01.2026 г., 20:31
🌍 Desert varnish is a thin, dark coating that forms on rocks in arid landscapes over thousands of years. It’s made from wind-blown clay and minerals, creating natural stone “paintings.” ✨ #deserts⚡#aridlandscapes⚡#geology⚡#geography⚡#nature⚡#earth 👉subscribe Amazing Geography 👉more Channels
@amazingeo · Post #157 · 01.09.2025 г., 16:12
🌍 In the world’s subtropical climate zones, some deserts like the Sahara and Arabian receive less than 2 centimeters of rain a year—making them among the driest places on Earth. ✨ #climatezones⚡#deserts⚡#rainfall⚡#geography⚡#nature⚡#earth 👉subscribe Amazing Geography🌍
@amazingeo · Post #274 · 20.09.2025 г., 19:31
🌍 In the Taklamakan Desert of China, some sand dunes reach up to 300 meters tall. Shifting winds keep these giant dunes moving, constantly reshaping the landscape year after year. ✨ #deserts⚡#dunes⚡#arid⚡#geography⚡#nature⚡#earth 👉subscribe Amazing Geography🌍
@amazingeo · Post #354 · 10.10.2025 г., 12:31
🌍 In Australia’s Simpson Desert, certain red sand dunes can “move” up to a meter each year as winds slowly push millions of grains, gradually shifting entire hills across the arid landscape. ✨ #deserts⚡#dunes⚡#Australia⚡#geography⚡#nature⚡#earth 👉subscribe Amazing Geography 👉more Channels
@amazingeo · Post #161 · 02.09.2025 г., 09:12
🌍 The Lut Desert in Iran holds the record for Earth’s hottest land temperature ever measured from space—an astonishing 80.8°C, far exceeding typical desert heat. ✨ #deserts⚡#temperature⚡#extremes⚡#geography⚡#nature⚡#earth 👉subscribe Amazing Geography🌍
@googlefactss · Post #40862 · 26.03.2026 г., 15:02
In Death Valley’s Racetrack Playa, large rocks, some weighing hundreds of kilograms, move across the dry lake bed, leaving long tracks behind. This happens when a rare set of conditions align. First, rain fills the lake bed with a shallow layer of water. At night, the water freezes into thin sheets of ice. As the sun warms the ground, the ice breaks into large, floating panels. Light winds then push the ice, slowly moving the rocks across the playa. The tracks left behind can last for decades, creating unique patterns. This natural process has been understood by scientists and is one of the most fascinating geological phenomena. 🪨❄️🌞 [Read more] @googlefactss #Nature#WeirdFacts#Geography#DidYouKnow#Deserts#Science#Mystery
@amazingeo · Post #535 · 25.12.2025 г., 12:31
🌍 In some deserts, rare rain triggers bursts of wildflowers that cover the landscape in color for just a few days. Seeds can lie dormant for years, waiting for the right moisture to bloom. ✨ #deserts⚡#aridlandscapes⚡#wildflowers⚡#geography⚡#nature⚡#earth 👉subscribe Amazing Geography 👉more Channels