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
Does this vibrant walkway look familiar?
Once just a canal, it's now a bustling pedestrian mall along Orchard Road!
Open spaces, art installations, and alfresco dining showcase how urban design transforms infrastructure into lively community hubs.
Uncover more behind-the-scenes stories about how urban design has shaped Singapore over the last 50 years
👉🏻go.gov.sg/UDPlanstoRealityTG
#UrbanDesign
🤔 Have you seen this staircase at Upper Thomson Road on your social media feed?
More than just a photogenic spot, it is the result of a community effort led by Joanne Teh, a resident at Yew Lian Park, who wanted to make the pathway safer and more attractive for everyone to use and enjoy.
If you have an idea to enhance and enliven the spaces around you, apply to get up to $20,000 from the Lively Places Fund for your initiatives!
Find out more
👉go.gov.sg/LivelyPlacesFundTG
#UrbanDesign#LivelyPlacesFund
Singapore’s hot weather can be a bother if you take a stroll at Marina Bay. But with our solar-powered breeze shelters strategically placed along the promenade, you don’t need no Oppas to shelter you from the heat! 🌬
#UrbanDesign#DiscoverSingapore#MarinaBay
A bunch of postcards just arrived in the mail for you! 💌
We’re working on a Recreation Master Plan to make way for more leisure opportunities. For the Central Area of Singapore, there are plans to enhance the attractiveness of the community space at Sultan Gate, improve the walk-cycle connectivity along the Inner Ring Corridor and more!
Want to help shape these spaces and other recreational spots in this region?
Share your best ideas with us here:
👉go.gov.sg/CentralAreaRecreTG
#DMP2025#RecreaMP#ExploreSingapore#Recreation#UrbanDesign#SpaceForOurDreams
Love the vibes at Holland Village? We do too 🙌
From low-rise buildings to continuous walkways and elegant signages, find out how we’re retaining the unique charm and familiar identity of the area through thoughtful planning and design.
#HollandVillage#ExploreSingapore#UrbanDesign#IdentityNode#SGHeritage
Can you picture a car-lite future for Singapore? With more cycling paths being built, it could soon be a reality!
The Bishan-to-City (B2C) Link is one of the pathways made possible by planners like Syafie, along with feedback from citizens like you, to make the island more connected and accessible for everyone. Watch on to learn more about his role and why he loves it.
Want to shape our city too? Explore career opportunities with URA now 👉http://go.gov.sg/URA-CareersSyafieTG
Also, learn more about our efforts to create a car-lite and sustainable city on our free guided community tours: http://go.gov.sg/ura-wcfd24
#UrbanDesign#URASingapore#DiscoverSingapore#Hiring#UrbanPlanning#WCFDsg#WorldCarFreeDay
The Shanghai Lingang Special Area master plan.
Design: Ennead Architects
Location: Shanghai, China
Ennead Architects has designed the Shanghai Lingang Special Area master plan (a new hub for global commerce) around the central axis that defines the Dishui Lake district in Shanghai.
One of the key features of the Shanghai Lingang Special Area will be “The Ring”. This circular, cantilevered observation deck, and museum will afford 360-degree views of nearby Dishui Lake, Shanghai and the Pacific Ocean.
The two towers flanking the Ring (The Tower Waterfall and Tower Rhomboid) are designed to become two of the most easily recognizable features of the new business district. Similar in scale, the towers have distinct identities.
#Architecture#arch_shovel#NewsArchitecture#News#Shanghai#China#Masterplan#CityPlanning#OfficeBuilding#CommercialArchitecture#UrbanDistrict#UrbanDesign