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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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Journey to Fluency

@fluencyinenglish · Post #7231 · 11.07.2019 г., 15:44

#vocabulary #collocations #ability @fluencyinenglish @fluencyinenglish @fluencyinenglish a‧bil‧i‧ty /əˈbɪləti/ noun (plural abilities) 1 [countable] the state of being able to do something ❇️ability to do something the ability to walk The health center serves all patients, regardless of their ability to pay. ❇️ [countable, uncountable] someone’s level of skill at doing something The test measures your mathematical ability. mixed ability classes ❇️of high/low etc ability students of average ability There are musicians of all abilities. ❇️somebody's abilities as something He showed his abilities as a leader @fluencyinenglish @fluencyinenglish @fluencyinenglish 🔹🔹Grammar Ability is followed by an infinitive with ‘to’, not by an -ing form. You say:I admire his ability to listen. ✗Don’t say: I admire his ability of listening. @fluencyinenglish @fluencyinenglish @fluencyinenglish 👉COLLOCATIONS high/low/average ability great/considerable ability remarkable/outstanding/exceptional ability mixed ability (=at different levels) uncanny ability (=an unusual ability that is difficult to explain) 🔹He has an uncanny ability for spotting investment opportunities. natural ability (also innate ability formal)(=an ability that you are born with) physical/athletic ability artistic/creative ability musical ability acting ability mental ability intellectual/academic ability verbal/linguistic ability (=language skills) The test is intended to measure the children's linguistic ability. mathematical ability proven ability (=that you have proved through your achievements) @fluencyinenglish @fluencyinenglish @fluencyinenglish 👉VERBS have the ability to do something (also possess the ability to do somethingformal) show/demonstrate the ability to do something lack the ability to do something @fluencyinenglish @fluencyinenglish @fluencyinenglish 👉PHRASES a level of ability/ability level a range of ability/ability range a test of ability/an ability test an ability group (=a group that students are taught in, based on their level of ability) @fluencyinenglish @fluencyinenglish @fluencyinenglish

Journey to Fluency

@fluencyinenglish · Post #6333 · 14.08.2018 г., 09:27

#vocabulary #collocations #ability @fluencyinenglish 💎Ability: skill/power to do sth شایستگی ، توانایی ، لیاقت ،صلاحیت ، قابلیت ، استطاعت 💎صفاتی که معمولا با ability می آیند. @fluencyinenglish Exceptional Extraordinary Great Outstanding Remarkable Uncanny Inherent Innate/natural ____________________________ VERB + ABILITY در ادامه ability را با افعالی که می توان به کار برد را مشاهده می کنید. @fluencyinenglish Have Demonstrate Show Acquire Develop Lack Lose Appreciate Recognize Examples: 🔵Both players demonstrated their ability to hit the ball hard. 🔵Fox's abilities were soon recognized. ____________________________ PHRASES @fluencyinenglish ⚪️a level of ability: There was a high level of ability among the school leavers. ⚪️a range of ability/abilities: I taught a wide range of abilities. @fluencyinenglish