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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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@centralchanel · Post #16336 · 29.01.2025 г., 18:36
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@centralchanel · Post #16237 · 23.01.2025 г., 19:24
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@centralchanel · Post #16199 · 21.01.2025 г., 20:14
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@centralchanel · Post #16130 · 18.01.2025 г., 20:42
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@centralchanel · Post #16024 · 13.01.2025 г., 19:18
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@centralchanel · Post #15958 · 10.01.2025 г., 20:48
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@centralchanel · Post #15775 · 02.01.2025 г., 19:29
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@centralchanel · Post #15645 · 26.12.2024 г., 20:40
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@centralchanel · Post #15731 · 30.12.2024 г., 20:54
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@centralchanel · Post #16005 · 12.01.2025 г., 19:46
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@centralchanel · Post #15619 · 25.12.2024 г., 20:02
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@centralchanel · Post #16597 · 18.02.2025 г., 10:16
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