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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: #disappearance
@interesting_planet_facts · Post #786 · 20.09.2025 г., 12:11
🌎 The disappearance of the Sodder children in 1945 remains unsolved. Five siblings vanished after a house fire in Fayetteville, West Virginia. Investigators found no remains in the ash, and sightings were later reported but never verified. A billboard seeking answers stood along Route 16 for decades. ✨ #history⚡#disappearance⚡#mystery 👉subscribe Interesting Planet
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@interesting_planet_facts · Post #991 · 31.10.2025 г., 12:11
🌎 In 2009, French aircraft Air France Flight 447 disappeared over the Atlantic during a flight from Rio de Janeiro to Paris. All 228 people on board died. The plane's wreckage was not found for nearly two years, when deep-sea searches located the main debris field at a depth of 3,900 meters. ✨ #aviation⚡#disappearance⚡#ocean 👉subscribe Interesting Planet 👉more Channels
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@interesting_planet_facts · Post #720 · 10.09.2025 г., 00:22
🌎 In 1815, the British brig HMS Rosalie was found abandoned and drifting near the Bahamas. The ship’s sails were set, and cargo untouched, but not a single crew member was found onboard. Official records note that the ship’s logbook and personal belongings were still present when discovered. ✨ #disappearance⚡#maritime⚡#mystery 👉subscribe Interesting Planet
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@interesting_planet_facts · Post #884 · 09.10.2025 г., 20:11
🌎 In 1973, Australian pilot Frederick Valentich disappeared while flying a Cessna 182L over Bass Strait. During radio contact, he reported a strange, unidentified craft circling his plane before transmission was lost. Despite a large search, neither Valentich nor his aircraft were ever found. ✨ #disappearance⚡#aviation⚡#australia 👉subscribe Interesting Planet 👉more Channels
@interesting_planet_facts · Post #657 · 30.08.2025 г., 16:22
🌎 In 1872, the Mary Celeste was found adrift in the Atlantic Ocean—its crew vanished without a trace, leaving food, cargo, and the ship untouched. This unsolved maritime mystery has puzzled historians ever since. ✨ #disappearance⚡#ship⚡#mystery 👉subscribe Interesting Planet
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@interesting_planet_facts · Post #1315 · 25.02.2026 г., 12:11
🌎 In 1925, British explorer Percy Fawcett vanished in Brazil's Amazon rainforest while searching for the lost city of "Z." Fawcett, his son, and a companion were last seen near the Upper Xingu River. Despite dozens of rescue missions over decades, no confirmed trace of the expedition was ever found. ✨ #amazon⚡#disappearance⚡#exploration 👉subscribe Interesting Planet 👉more Channels