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: #gateiostartup
@walken_channel · Post #244 · 23.07.2022 г., 14:09
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@byinchan · Post #122 · 07.09.2024 г., 06:48
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@byinchan · Post #111 · 05.09.2024 г., 15:25
📣Day 3 of voting! $8,000 up for grabs—vote for your favorite project by 6:00 AM, Sep 8 (UTC)! 🏆Winning projects will shine in the spotlight! 💎$BYIN$CEC$MAK$ANS 🔁Share to rally support for your pick! 👉Vote:https://gate.io/activities/startupvote?gt_disable_intercept_jump=1&now_period=5 #GateioStartup#Memecoins#Airdrop
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@byinchan · Post #106 · 04.09.2024 г., 09:48
🚀$8,000 up for grabs! #Vote for your favorite project by 06:00 AM, Sep 8 (UTC)! $BYIN$CEC$MAK$ANS 🏆Winning projects get the spotlight 🔁Retweet to support your pick Vote now:https://gate.io/activities/startupvote?gt_disable_intercept_jump=1&now_period=5 #GateioStartup#Memecoins#Airdrop
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@Holdcoin_Channel · Post #309 · 11.12.2024 г., 12:59
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@yourownads · Post #190 · 12.02.2025 г., 12:09
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@yourownads · Post #149 · 06.01.2025 г., 20:26
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@yourownads · Post #187 · 08.02.2025 г., 16:29
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