TGINSIGHT SIMILAR POSTS
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: #watercycle
@amazingeo · Post #669 · 22.03.2026 г., 20:31
🌍 Water molecules in the ocean today could have once traveled through glaciers, rivers, or clouds—completing a global journey called the water cycle that never truly ends. ✨ #hydrology⚡#watercycle⚡#earth⚡#geography⚡#nature 👉subscribe Amazing Geography 👉more Channels
@amazingeo · Post #134 · 28.08.2025 г., 20:12
🌍 Some of the water we drink today has cycled through dinosaurs and ancient forests. Water molecules can take thousands of years to complete a single journey through the global water cycle. ✨ #hydrology⚡#watercycle⚡#earth⚡#geography⚡#nature 👉subscribe Amazing Geography🌍
@amazingeo · Post #627 · 12.02.2026 г., 12:31
🌍 Water in the atmosphere is always on the move—at any moment, only about 0.001% of Earth’s water is in the air as vapor, yet this tiny fraction drives all rain, snow, and weather worldwide. ✨ #hydrology⚡#watercycle⚡#atmosphere⚡#geography⚡#nature⚡#earth 👉subscribe Amazing Geography 👉more Channels
@amazingeo · Post #327 · 03.10.2025 г., 15:31
🌍 Water vapor in the air isn’t just invisible—it’s crucial for moving energy around the planet. When vapor condenses into clouds, it releases heat that drives weather systems worldwide. ✨ #hydrology⚡#atmosphere⚡#watercycle⚡#geography⚡#nature⚡#earth 👉subscribe Amazing Geography 👉more Channels
@amazingeo · Post #246 · 16.09.2025 г., 09:12
🌍 About 90% of the water exchanged in the global water cycle happens over the oceans, not land. Yet this invisible ocean-to-sky movement powers most of the world’s rainfall. ✨ #hydrology⚡#watercycle⚡#oceans⚡#geography⚡#nature⚡#earth 👉subscribe Amazing Geography🌍
@amazingeo · Post #709 · 12.05.2026 г., 20:31
🌍 Some Antarctic lakes stay liquid under thick ice all year, kept warm by geothermal heat from below. These hidden waters host unique microbes adapted to extreme, sunless conditions. ✨ #hydrology⚡#antarctica⚡#watercycle⚡#geography⚡#nature⚡#earth 👉subscribe Amazing Geography 👉more Channels
@amazingeo · Post #172 · 04.09.2025 г., 03:12
🌍 Just 0.001% of all water on Earth is found in rivers, lakes, and the atmosphere. The vast majority is locked away in ice sheets, glaciers, or underground where we rarely see it. ✨ #hydrology⚡#watercycle⚡#freshwater⚡#geography⚡#nature⚡#earth 👉subscribe Amazing Geography🌍
@amazingeo · Post #94 · 22.08.2025 г., 09:12
🌍 The water cycle, or hydrologic cycle, constantly moves water through evaporation, condensation, and precipitation, powering rivers, forming clouds, and shaping climates worldwide. ✨ #watercycle⚡#evaporation⚡#precipitation⚡#geography⚡#nature⚡#earth 👉subscribe Amazing Geography🌍