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
😄Consider
➖➖➖➖➖➖
🔘 The verb, consider can mean spend time to think, or think about something
🔜 I'm going to take some time to consider, then I'll tell you my decision.
🔜I'm considering how we can best use our time.
🔘 Consider can have a similar meaning to 'take into account' to say that somethng is important when making a decision or judgement.
🔜 She's learnt so much, considering how late she started the course.
🔘 Consider can be used with an object and an adjective or noun to describe what we think something or someone is like.
🔜 I consider him to be the best writer of his generation.
🔜 I consider her an expert. She knows so much about history.
#Consider👨🏫@America
➖➖➖➖➖➖➖➖➖➖➖➖
🆕 Crypto News @Money
😁 Crypto Game @Egame
🇺🇸 US News @America
🇯🇵 Japan News @Japan
🇦🇪 UAE News @Dubai
▶️ Popular Movies @Videos
😜 Best Funny Video @Funnys
😄Consider
➖➖➖➖➖➖
🔘 The verb, consider can mean spend time to think, or think about something
🔜 I'm going to take some time to consider, then I'll tell you my decision.
🔜I'm considering how we can best use our time.
🔘 Consider can have a similar meaning to 'take into account' to say that somethng is important when making a decision or judgement.
🔜 She's learnt so much, considering how late she started the course.
🔘 Consider can be used with an object and an adjective or noun to describe what we think something or someone is like.
🔜 I consider him to be the best writer of his generation.
🔜 I consider her an expert. She knows so much about history.
#Consider👨🏫@America
➖➖➖➖➖➖➖➖➖➖➖➖
🆕 Crypto News @Money
😁 Crypto Game @Egame
🇺🇸 US News @America
🇯🇵 Japan News @Japan
🇦🇪 UAE News @Dubai
▶️ Popular Movies @Videos
😜 Best Funny Video @Funnys
😄Consider
➖➖➖➖➖➖
🔘 The verb, consider can mean spend time to think, or think about something
🔜 I'm going to take some time to consider, then I'll tell you my decision.
🔜I'm considering how we can best use our time.
🔘 Consider can have a similar meaning to 'take into account' to say that somethng is important when making a decision or judgement.
🔜 She's learnt so much, considering how late she started the course.
🔘 Consider can be used with an object and an adjective or noun to describe what we think something or someone is like.
🔜 I consider him to be the best writer of his generation.
🔜 I consider her an expert. She knows so much about history.
#Consider👨🏫@America
➖➖➖➖➖➖➖➖➖➖➖➖
🆕 Crypto News @Money
😁 Crypto Game @Egame
🇺🇸 US News @America
🇯🇵 Japan News @Japan
🇦🇪 UAE News @Dubai
▶️ Popular Movies @Videos
😜 Best Funny Video @Funnys
📰Colorado Lawmakers Consider Bill Allowing Older Adults to Opt Out of Jury Duty in State Courts
🔗https://dailycoloradonews.com/colorado-lawmakers-consider-bill-older-adults-opt-out-jury-duty/?utm_source=telegram&utm_medium=social&utm_campaign=zimm-distribute
via Daily Political Press
#Courts#Colorado#Lawmakers#Consider#Latest
📰Colorado Lawmakers Consider Bill Allowing Older Adults to Opt Out of Jury Duty in State Courts
🔗https://dailycoloradonews.com/colorado-lawmakers-consider-bill-older-adults-opt-out-jury-duty/?utm_source=telegram&utm_medium=social&utm_campaign=zimm-distribute
via Daily Political Press
#Courts#Colorado#Lawmakers#Consider#Latest