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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ኢትዮጵያውያን ተማሪዎች በሩሲያ፡ የትምህርት ጉዞ
💡Why thousands choose Russian universities:
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#EthiopianStudents#RussianEducation#StudyAbroad#ኢትዮጵያ#EducationJourney🇪🇹🇷🇺
🎓 ETHIOPIAN EDUCATION: Universities, Careers & Global Dreams
ትምህርቶች በኢትዮጵያ
💡 Discover Ethiopia's education landscape: from ancient learning centers to modern universities, where young Ethiopians dream of studying abroad.
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• Addis Ababa University (1950) - The flagship, medicine & engineering excellence
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• Science, Technology, Engineering, Mathematics - the future job engines
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💰 PRO TIPS:
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✨ Expert-reviewed content | Verified by local Ethiopian education specialist
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