А знаете ли вы, что в Bash есть особая переменная "$_" ? Из описания можно узнать, что в переменную "$_" помещается последний аргумент последней команды.
Что-то знакомое? Конечно, в Python есть примерно тоже самое.
Мы знаем, что дата первого релиза Bash (8 июня 1989) несколько раньше чем первый релиз Python (20 февраля 1991). Если учесть, что по задумке автора Python это агрегация самых успешных практик отовсюду, можно ли сказать что именно эта фишка к нему пришла из Bash? Ни подтверждения ни опровержения я пока не нашел.
Давайте просто считать это совпадением 😉
А как это может быть полезно в Bash?
Приведу простой пример, который оценят те, кто часто работает в терминале.
Допустим, нам надо создать директорию и зайти в неё. Что обычно делаем?
:~$ mkdir foldername
:~$ cd foldername
:~/foldername$
Как это сделать в одну команду?
:~$ mkdir foldername && cd foldername
:~/foldername$
Уже лучше, но хочется короче, без повторов. Вот тут и пригодится наша переменная. Напомню, что в неё сохраняется последний аргумент предыдущей команды.
:~$ mkdir foldername && cd $_
:~/foldername$
_________________
PS.
Символы "&&"" разделяют команды и означают, что требуется выполнить вторую команду только если первая завершилась успешно.
#linux#tricks
💥CLOSED BETA TESTERS SELECTED!
Attention all #QuasarK enthusiasts!
We are thrilled to announce that we have selected our closed beta testers for the upcoming QuasarK app on iOS and Android 🎉
To our selected beta testers, congratulations! 🥳 You are the chosen ones who will get an exclusive sneak peek 👀 into the app's features, functionalities, as well as a bunch of exciting perks. Your valuable feedback and insights will help us refine and enhance🚀 the QuasarK experience for everyone.
✅ We have granted all beta testers a special role in our QuasarK Discord server. This role comes with access to a private channel dedicated to the closed beta testing. There, we will keep you updated on all the important information📩 regarding the app's access, updates, and any announcements related to the beta testing phase.
Make sure to check your Discord notifications for the role assignment and say hello in the private chats📲💬
We are incredibly excited 🙈 to have you on board, and we can't wait to embark on this beta testing journey together. Your input and feedback will play a vital role in shaping the final release of QuasarK 💫, and we greatly appreciate your dedication and involvement in this process.
Thank you once again 😍 for being part of the QuasarK community and for your continued support. Stay tuned🔔 for more updates, surprises, and the official launch of QuasarK coming soon!
📢CLOSED BETA WHITELIST CLOSED
Attention, QuasarK Community: the application period for our closed beta is now officially closed. We want to express our heartfelt thanks ❤️ to everyone who applied and showed their interest in being a part of this exclusive testing phase. Your support and enthusiasm mean the world to us! 👏
🚀 But hold on tight, because the journey is just getting started! In a matter of days we’ll be reaching out to our whitelisted beta testers🏆. If you made it to the whitelist, keep an eye on your notifications and direct messages 📩 as we will be sharing important updates and instructions with you. BEWARE OF SCAM!
Stay tuned for more updates and announcements 👀 as we continue to make progress towards the launch of QuasarK. We appreciate your ongoing support and look forward to embarking on this exciting journey together!
#QuasarK#ClosedBeta#BetaTesters#ComingSoon
💫📝 JOIN QUASARK BETA
Calling all crypto enthusiasts!
We are thrilled to announce that QuasarK is to launch its closed beta and we need OGs willing to be the first to experience the power and convenience of the next-gen wallet 🙌
🔍 Become a Beta Tester and play an active role in refining and improving 💎 the wallet before its public release. And your effort will be rewarded 💰
💥 How to Join QuasarK Beta
1️⃣ Participate in this campaign: https://zealy.io/c/quazark/invite/yJwJUITfB-ehsbeVWcaOP
2️⃣ Complete all the tasks and get 'QuasarK Closed Beta' Discord role. Lucky beta testers will be selected from all holders of this role!
🚀 Don't miss this incredible opportunity to be at the forefront of crypto innovation. Join the QuasarK beta testing program ✅, contribute to the development of a game-changing multichain wallet. The number of testers is very limited, and the rewards are well-worth it!
Together, let's revolutionize the way we manage our digital assets!
#QuasarK#Crypto#DeFi#Web3#Beta
🚀 Last Call for the QuasarK Closed Beta Whitelist
Are you ready to experience the future of cryptocurrency wallets? The countdown is on ⏰, and we don't want you to miss out on this exciting opportunity!
Here's why you want to be part of our closed beta:
1️⃣ Unrivaled Security: Quasark ensures the safety of your funds like never before. Rest easy, knowing your assets are protected.
2️⃣ User-Friendly Interface: Effortlessly navigate through features, send and receive funds, and stay in control of your financial future.
3️⃣ Cutting-Edge Features: From instant swaps to customizable interface, we've got you covered with a suite of powerful tools.
4️⃣ Prices&Market trends: Access insightful charts and information to make informed investment decisions.
👉 Don't wait any longer! Secure your spot before SUNDAY:
https://zealy.io/c/quazark/invite/yJwJUITfB-ehsbeVWcaOP
#Quasark#CryptoWallet#ClosedBeta#DigitalAssets#DeFi