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Environment variables are defined by the shell and shell scripts. To list the current environment variables, type export: ~ $ export declare -x DISPLA 阅读全文
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watch For example every 5 second, I want to print out the time then save the time into the a txt file $watch -n5 'echo `date +%T` >> hello.txt' # then 阅读全文
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Backticks Using to exec cmd and return the output as string $ echo `date` Fri Jun 7 15:40:11 EEST 2024 The same effect you can achieve by using $ echo 阅读全文
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Ping ping is a utility used to test the reachability of a host on an IP network and to measure the round-trip time for messages sent from the originat 阅读全文
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The cards on the DJI site have an effect where the hovered card expands and the other cards shrink: In order to emulate this effect we'll use Flexbox. 阅读全文
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Currently we are animating to a fixed height of 100px on hover since browsers can't animate from 0 to auto: <p class="h-0 overflow-hidden text-white/7 阅读全文
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pbcopy is a command-line utility available on macOS that allows you to copy the output of a command directly to the clipboard. It can be very handy fo 阅读全文
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Sometimes it's handy to break long lines into shorter lines. # read moby-dick file for first 250 lines # then fold each line to have max 30 char (-w) 阅读全文
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Calendar cal May 2024 Su Mo Tu We Th Fr Sa 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 # all months cal 2024 # 阅读全文
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grep is a powerful command-line tool used for searching text using patterns. It's widely used for finding specific text within files or output streams 阅读全文