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: #query
@WritersCafe · Post #521 · 25.12.2025 г., 14:03
New#query by 8047007036from@WritersClub: 🤔 Hi i wanna ask something ,in your free time what genre do you guys like to read in fictional novels- comic ,medical ,sci-fi,mystery, teen romance ,historical , murder mystery. Please do tell 👉🏻Answer in comments below!
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@WritersCafe · Post #520 · 24.12.2025 г., 05:41
New#query by 200078866from@WritersClub: 🤔 list the publishing platforms / agencies where a new writer can publish their work. Please mention whether they are free / paid and preferably their plans and contact / website. 👉🏻Answer in comments below!
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@WritersCafe · Post #513 · 26.08.2025 г., 08:32
New#query by 7273588002from@WritersClub: 🤔 I want to publish my book where can I...? 👉🏻Answer in comments below!
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@WritersCafe · Post #402 · 24.10.2023 г., 10:10
New#query by 5135634813from@WritersClub: 🤔 How long should the first chapter of a novel be?? 👉🏻Answer in comments below!
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@WritersCafe · Post #398 · 13.01.2023 г., 15:09
New#query by 5135634813from@WritersClub: 🤔 I want to describe a scene where two people ( a girl and a boy ) Are standing in front of each other's and thinking simultaneously. Is it possible to describe there thoughts together? If yes then please anyone help me with an example. 👉🏻Answer in comments below!
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@WritersCafe · Post #374 · 24.07.2022 г., 14:27
New#query by 5135634813from@WritersClub: 🤔 I've been working on some fictional plot for months, but I am unable to find right words. Also how do I decide what's better voice for the novel male female or 3rd person??? 👉🏻Answer in comments below!
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@WritersCafe · Post #361 · 03.07.2022 г., 08:54
New #query by 136817688 from @WritersClub: 🤔 What makes a poem good? Rhythm, rhyme, skills with words or pure emotions? 👉🏻 Answer in comments below!
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@WritersCafe · Post #334 · 09.10.2021 г., 05:14
New#query by 1736858014from@WritersClub: 🤔 Which is the best book or website to learn poetic devices? 👉🏻Answer in comments below!
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@WritersCafe · Post #332 · 19.09.2021 г., 11:53
New#query by 200078866from@WritersClub: 🤔 I want some korean names and also some Japanese names for my character, please suggest. 👉🏻Answer in comments below!
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@WritersCafe · Post #330 · 03.08.2021 г., 17:00
New#query by 826179191from@WritersClub: 🤔 How can I share my work and request others to check it? 👉🏻Answer in comments below!
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@WritersCafe · Post #328 · 28.07.2021 г., 15:00
New#query by 1423706429from@WritersClub: 🤔 How to illustrate parents in a novel written as a first person (Either by calling 'mum/dad' or by specifying their names)? 👉🏻Answer in comments below!
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@WritersCafe · Post #325 · 27.06.2021 г., 03:37
New#query by 1183521428from@WritersClub: 🤔 Can i share links of my blogs? 👉🏻Answer in comments below!
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