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
📜
We are aware of the #DengueFever outbreak reported in Sokoto State.
Based on a dynamic risk assessment, the current risk level of the dengue outbreak has been determined to be MODERATE.
However, measures have been taken by the National Emerging Viral Haemorrhagic Diseases Technical Working Group and partners to control the outbreak and prevent the further spread.
🔗Press release
https://ncdc.gov.ng/news/506/ncdc-on-alert-following-the-confirmation-of-the-dengue-fever-outbreak-in-sokoto-state.
In November 2025, 29 suspected cases of dengue fever were recorded, with 6 confirmed and 1 death reported.
Between January and November 2025, a total of 735 suspected cases were reported across the country among both adults and children.
These figures highlight the importance of continued vigilance and preventive action.
Protect Yourself. Avoid mosquito bites by:
✅ Keeping your surroundings clean and free of stagnant water
✅ Supporting community clean-up efforts to reduce mosquito breeding sites
✅ Visit the nearest health facility early if you feel unwell
Full Sitrep: https://ncdc.gov.ng/themes/common/files/sitreps/903d9215ad81cbdee39f6b098f3eea97.pdf
#DengueFever#StaySafe # NCDCNigeria
Mosquitoes are carriers of various diseases, including #Malaria, #YellowFever, #DengueFever, and #ZikaVirus, with cases rising during the rainy season.
You can protect yourself:
➡Eliminate stagnant water to prevent mosquito breeding
➡Use mosquito repellent and wear clothing that covers your arms and legs
➡Sleep under insecticide-treated mosquito nets
➡Keep drainages and gutters clear
➡Install screens on doors and windows
#WorldMosquitoDay
Common Viral Haemorrhagic Fevers #VHFs include #LassaFever, #EbolaVirusDisease, #YellowFever, #DengueFever, #MarburgFever and #CrimeanCongoHaemorrhagicFever.
What are the #InfectionPreventionandControl practices that need to be in place in the management of VHFs?
🔗Download our National Guideline on #IPC for #VHF
https://ncdc.gov.ng/themes/common/docs/protocols/111_1579986179.pdf