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
#MDT/USDT analysis :
#MDT is currently in a downtrend making new lows. The bearish momentum is expected to continue, potentially leading to further declines. For a short entry, consider waiting for a test of the resistance level before initiating a short position.
TF : 2H
Entry : $0.02883
Target : $0.02495
SL : $0.03150
#MDT/USDT analysis :
#MDT is currently in a downtrend, consistently forming lower lows (LLs) and lower highs (LHs) below the 200 EMA. The price is anticipated to continue its bearish momentum and test lower levels. It is recommended to wait for a pullback for a short entry opportunity.
TF : 4H
Entry : $0.05060
Target : $0.04127
SL : $0.05536
#MDT/USDT analysis :
#MDT is currently in an uptrend, characterized by the formation of higher highs (HHs) and higher lows (HLs). The price has retraced to test the 200 EMA, successfully forming a higher low before bouncing back. Wait for a breakout of the trendline, as the price is anticipated to test the previous swing high.
TF : 4H
Entry : $0.06650
Target : $0.08500
SL : $0.05715
#MDT/USDT analysis :
#MDT is in an uptrend, forming higher highs (HHs) and higher lows (HLs) above the 200 EMA. The price has recently tested the support zone and has bounced back from that level. It is anticipated that the bullish momentum will continue, leading to a potential test of previous highs.
TF : 2h
Entry : $0.05624
Target : $0.06177
SL : $0.05297
#MDT/USDT analysis :
#MDT is currently retracing back to the 200 EMA while forming higher highs (HHs) and higher lows (HLs) in its structure. The price is bouncing back from the support zone and is expected to test the previous swing high.
TF : 1D
Entry : $0.04253
Target : $0.05229
SL : $0.03668
#MDT/USDT analysis :
Based on the current market analysis, #MDT is currently experiencing a downtrend, trading below the 200 EMA. Following a correction phase, the price has been rejected from the 200 EMA. The anticipated next move is for the downtrend to persist with an impulsive movement, potentially testing previous lows.
TF : 4H
Entry : $0.0364
Target : $0.0290
SL : $0.0405
#MDT reached the ceiling of the trading range on 12H Time frame,we expect another bullish movement incoming..🚀
❄️@signals_bitcoin_crypto❄️
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