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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Crypto Mining Highlights for January
Key developments in crypto mining for January include:
- Canaan launches new home mining machines.
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🚀 Bhutan's Bitcoin Mining Activities May Have Slowed Amid Economic Pressures
Bhutan may have halted or reduced its Bitcoin mining operations after selling 70% of its Bitcoin holdings. According to Foresight News, this move contrasts with other major institutions and sovereign nations that are increasing their cryptocurrency and gold reserves. Bhutan's hydropower is reportedly being redirected to supply electricity to neighboring India rather than being used for Bitcoin mining. Economic pressures, along with declining Bitcoin prices, increased network difficulty, and halving pressures, are squeezing mining profitability. As of now, Druk Holding and Investments, the sovereign wealth fund managing Bhutan's Bitcoin assets, has not publicly commented on any asset transfers or the status of its mining operations.
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🚀 AI TRENDS | Bitcoin Mining Centralization and Edge AI Market Growth Projected
Bitcoin mining is anticipated to become increasingly centralized, according to Alex Thorn, head of Galaxy Research. According to NS3.AI, Thorn's insights suggest a shift in the mining landscape, potentially impacting the decentralization that has been a hallmark of the cryptocurrency. Meanwhile, the edge AI market is expected to experience significant growth. Grand View Research forecasts that the market will expand from approximately $25 billion in 2025 to $119 billion by 2033, indicating a trend towards more localized AI applications.
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