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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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🎙 Foreign Minister Sergey Lavrov’s answers to questions during a special session of a large MGIMO discussion programme combined with the 7th Global Forum of Young Diplomats, Russia and Its Role in Shaping a Multipolar World (Sochi, March 4, 2024) 🔹 Western priorities in relations with Russia 🔹 The modern concept of multipolarity 🔹 The role of the UN in international relations 🔹 EU plans to interfere in the Russian presidential election 🔹 Fighting the politicisation of sport 🔹 Russia's relations with its closest partners 🔹 Russia-US relations 📰Read in full 📺Watch in full *** #CrimeanBridge What is interesting are the words said by Western figures, including the response of German politicians when the truth about the recording of conversations between German generals was revealed. Some of them are concerned there was a leak from a secure line. The fact that German weapons and the personnel servicing them are going to be used to attack the Russian Federation, including the Crimean Bridge and ammo depots, is not surprising. They wonder why the secure line turned out to be not so secure. This says a lot. #Election2024 We have accumulated a lot of evidence on how the EU embassies in Moscow are preparing for our presidential elections. I am referring to interference mechanisms, certain “supporting projects” for the non-systemic opposition – in short, things that embassies have no right to address. #RussiaUS The Americans approach us every now and then. They have asked us not to deploy weapons in space. They have asked for a meeting. As if nothing happened. They say they must defeat us on the battlefield in Ukraine but other than that, let’s discuss strategic issues. President Vladimir Putin said that they are not serious and it goes against the natural course of things.