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
Bot API 7.0
Announcing our biggest Bot API update yet!
Reactions
• Introducing full reaction support for bots.
• Bots can now react to messages with setMessageReaction.
• Message reactions now generate updates for bots.
• Added the available_reactions field to the class Chat.
Replies 2.0
• Bots can now reply to messages in other chats or topics.
• Added the ExternalReplyInfo class, to track replies across chats.
• The new class ReplyParameters replaces individual reply options in all relevant methods and lets bots quote parts of any message.
• The new field quote of the class Message lets bots detect incoming quoted text.
Link Preview Customization
• Bots can now set a custom URL to generate link previews in outgoing messages.
• Added support for custom size and position of link previews.
• Added the class LinkPreviewOptions to support these new options.
Batch Actions
• Bots can now delete multiple messages in a single request via deleteMessages.
• Bots can now forward or copy multiple messages in a single request via the respective forwardMessages and copyMessages methods.
Boosts & Giveaways
• Added support for Giveaway messages, allowing bots to detect their creation and completion.
• Added updates about chat boost changes via the new classes ChatBoostUpdated and ChatBoostRemoved.
• Bots can now see if a boost came from a premium sub, a gift code, or a giveaway, as well as check all active user boosts via getUserChatBoosts.
General
•Blockquotes are now supported in MarkdownV2 and HTML parse modes.
• Web Apps won't close when calling openTelegramLink.
• Web Apps can now toggle the visibility and on-click behavior of the Settings Button.
• Bots can now request multiple users, see KeyboardButtonRequestUsers.
• The class Chat has new fields holding profile and background colors, custom emoji, and more.
• And a great deal more. See the full changelog for details:
https://core.telegram.org/bots/api-changelog#december-29-2023
Happy Holidays from the Telegram Team 🎆
🆓REDEEM CODES🆓
🚀AFK Arena New #Codes [#December 2025]
👉Code:【 u4fctemje2 】
🎁Gift: 1k diamonds and multiple eight-hour boosts
For your convenience, we have arranged all new working AFK Arena codes. Go to 🔗AFK Arena Redeem Code (Complete List) for a batch of active redeem codes.
Add @APKFreeDownloader_Bot to get any apk you want.
Wikipedia每日一图（#December 29, 2025）https://ift.tt/8t1Yzmk
Pirogue running on the Mekong in front of an island hosting a Samanea saman (rain tree) and other trees, at sunset with pink clouds, seen from Don Det, Si Phan Don, Laos.. 了解更多 . #Wikipedia每日一图
Wikipedia每日一图（#December 26, 2025）https://ift.tt/oXURLCx
The American heavy metal band Soulfly at the With Full Force Summer Open Air 2018 in Ferropolis, Germany. 了解更多 . #Wikipedia每日一图
Wikipedia每日一图（#December 23, 2025）https://ift.tt/civyKR8
JŽ 06-018 steam locomotive gear, museum steam locomotive, Central station Ljubljana, Slovenia. 了解更多 . #Wikipedia每日一图
Wikipedia每日一图（#December 22, 2025）https://ift.tt/MABV5Fk
Snow on Ayase river by Shōtei Takahashi. 1915 woodcut print from the Rijksmuseum collection.. 了解更多 . #Wikipedia每日一图
Wikipedia每日一图（#December 21, 2025）https://ift.tt/3A18ovM
View of coastline northwest from above Manarola: fields and steep trail to Volastra in foreground, Corniglia Station and town centre, north to Punta Mesco. Depicts the north half of Cinque Terre National Park coastline. Liguria, Italy. 了解更多 . #Wikipedia每日一图