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
🔅ETHUSD Will Go Up! Long!📈
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Here is our detailed technical review for📊ETHUSD.
The price is testing a key support 2,258.90.
Current market trend & oversold RSI makes me think that buyers will push the price. I will anticipate a bullish movement at least to 2,300.40 level.
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🔅ETHUSD Will Go Up! Buy!📈
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The market is on a crucial zone of demand 2,331.82.
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The price is testing a key resistance 2,265.42.
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🔅ETHUSD Is Bearish! Sell!📉
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The price is testing a key resistance 2,429.70.
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🔅ETHUSD Will Move Higher! Long!📈
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The market is approaching a significant support area 2,028.29.
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The market is approaching a key horizontal level 1,989.88.
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🔅ETHUSD Is Going Down! Sell!📉
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The market is approaching a significant resistance area 2,131.97.
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🔅ETHUSD Will Go Up From Support! Buy!📈
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The price is testing a key support 1,979.31.
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The market is approaching a key horizontal level 1,961.90.
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The market is approaching a key horizontal level 2,050.77.
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🔅ETHUSD Will Move Higher! Long!📈
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The market is approaching a significant support area 2,676.10.
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🔅ETHUSD Is Very Bearish! Sell!📉
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The price is testing a key resistance 2,894.86.
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