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
🚀 Iran's Ten-Point Plan Gains Consensus as Negotiation Framework
On April 10, Iran's Deputy Foreign Minister Ravanchi announced during a meeting with foreign diplomats and international organization representatives in Iran that a consensus has been reached to use Iran's ten-point plan as the basis for negotiations. According to BlockBeats, Ravanchi emphasized Iran's openness to diplomacy and dialogue but firmly rejected any discussions based on false information intended to deceive or pave the way for renewed military aggression against Iran.
#Iran#Diplomacy#Negotiation#InternationalRelations#ForeignPolicy
🚀 Dollar Faces Pressure Amid US-Iran Negotiation Reports
The dollar-and-oil buying trade is experiencing challenges as reports of negotiations between the United States and Iran surface. According to NS3.AI, the US Dollar Spot Index has decreased by approximately 1.4% this week, marking its largest weekly drop since January. This decline is attributed to shifts in foreign exchange trading, influenced by headlines surrounding the negotiations and a fragile ceasefire.
#Dollar#US#Iran#Negotiation#Forex#Oil#Ceasefire#CurrencyMarket
🚀 Trump Denounces Reports on Iran Negotiation Plan as False
U.S. President Donald Trump has criticized reports from The New York Times and CNN regarding a ten-point plan on Iran negotiations. According to Odaily, Trump labeled these reports as entirely fabricated and aimed at discrediting those involved in the peace process. He dismissed the points as fraudulent schemes and called the media outlets 'evil losers.' Trump concluded his statement with a call to 'Make America Great Again.'
#Trump#Iran#Negotiation#USPolitics#Media#FakeNews#PeaceProcess#MAGA
🚀 Trump Criticizes Iran's Media Tactics on Truth Social
U.S. President Donald Trump expressed his views on Iran's media strategies on April 11 via Truth Social. According to BlockBeats, Trump stated that Iranians are more adept at handling fake news media and public relations than engaging in warfare. He remarked that Iran seems unaware of its lack of leverage, aside from short-term 'extortion' through international waterways. Trump concluded that Iran's current existence is solely for negotiation purposes.
#Trump#Iran#MediaTactics#FakeNews#PublicRelations#Negotiation#TruthSocial#Extortion#InternationalWaterways