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: #idioms
@Learn_English_from_Zero_to_Hero · Post #60774 · 11.05.2026 г., 18:25
#idioms 💥Let the 'side down (BrE) ○to disappoint your family, friends, team, etc. by not being as successful as they expect, or not helping or supporting them. ☆ John would never let the side down. ☆ I knew I was letting the side down (= disappointing my family, etc.) by not going to college.
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@Learn_English_from_Zero_to_Hero · Post #60767 · 09.05.2026 г., 19:07
#idioms 💥Water off a duck's back ○criticism or unpleasant things have no effect on someone; they don't take it personally. ▪️ No matter how much they criticize her, it's like water off a duck's back — she just keeps going. ▪️ He laughed off all the negative comments, letting them be water off a duck's back.
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@Learn_English_from_Zero_to_Hero · Post #60729 · 19.04.2026 г., 05:59
#idioms 💥A BOOTLICKER 🔅Someone who flatters or obeys others in power to gain favour. ▪️Jeff is such a bootlicker, always agreeing with the boss no matter what.
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@Learn_English_from_Zero_to_Hero · Post #60676 · 29.03.2026 г., 13:45
#idioms ☆Crunch time •The period of time just before a project has to be completed and everyone has to work hard . ●I’m not getting much sleep these days, because it’s crunch time at work.
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@Learn_English_from_Zero_to_Hero · Post #60675 · 29.03.2026 г., 13:44
#idioms ☆Run on fumes •To continue to stay awake when feeling exhausted . ●I really have to take a nap now. I haven’t slept for twenty hours and I’m running on fumes.
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@Learn_English_from_Zero_to_Hero · Post #60619 · 04.02.2026 г., 18:47
#idioms
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@Learn_English_from_Zero_to_Hero · Post #60604 · 26.01.2026 г., 16:56
#idioms ⚜Turn the clock back ●to return to a situation that existed in the past; to return to old-fashioned methods or ideas. ●This new law is an attempt to turn the clock back.
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@Learn_English_from_Zero_to_Hero · Post #60490 · 11.11.2025 г., 16:25
#idioms 💥 leave sb to their own devices ▪️to leave sb alone to do as they wish. 🔅Once I’ve explained things to him I tend to leave him to his own devices.
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@Learn_English_from_Zero_to_Hero · Post #60486 · 08.11.2025 г., 18:06
#Idioms 💢To pull out all the stops ♠️To make every possible effort to get something done Ex:- The company pulled out all the stops to advertise their new product.
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@Learn_English_from_Zero_to_Hero · Post #60336 · 02.10.2025 г., 18:23
#idioms 💥After one's own heart 🔅having the same opinions or interests as you ⚜When you brought chocolates I knew you were a woman after my own heart.
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@Learn_English_from_Zero_to_Hero · Post #60318 · 28.09.2025 г., 17:18
#idioms 💥Pull the wool over someone's eyes💥
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@Learn_English_from_Zero_to_Hero · Post #60247 · 13.09.2025 г., 19:01
#idioms 💥in a bind | fix | jam ⚜If someone is in a bind, or in a jam, or in a fix, they're in a bad or difficult situation. ⚡️Jimmy's in a bind because he owes a lot of money to some mafia guys, and he hasn't got it.
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