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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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Blockchain Life 2025, Dubai | October 28–29 The 15th anniversary edition of Blockchain Life is set to become the largest crypto event of the year for those building careers and businesses in the Web3 space. With over 15,000 attendees expected, the forum will feature three content stages and a vibrant open-air program. Five reasons to get this on your schedule.: 1️⃣Positioning for the next market phase. Industry experts will share growth scenarios and actionable steps to help you make the most of the upcoming cycle. 2️⃣First-hand tech trends. Industry leaders will present innovations that could go mainstream within months. Simultaneous translation into Russian will be available. 3️⃣Global networking. With representatives from funds, exchanges, and infrastructure projects, the event is a powerful platform for partnerships, investment, and career opportunities. 4️⃣Expanded program. In addition to the main forum, expect themed meetups, yacht tours, and exclusive evening events. 5️⃣Atmospheric AfterParty. As tradition goes, the organizers will bring in top international performers — the lineup will be announced closer to the date. 🎟Get your ticket with a 10% discount here using promo code TONEVENTS 🚬See you in Dubai! #BlockchainLife2025#Dubai#CryptoConference#Web3#CryptoNews