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The test command in Unix evaluates the expression parameter. In most recent shell implementations, it is a shell builtin, even though the external version still exists.In the second form of the command, the [ ] (brackets) must be surrounded by blank spaces (this is because [is a program and POSIX compatible shells require a space between the program name and its arguments).
curl defaults to displaying the output it retrieves to the standard output specified on the system (usually the terminal window). So running the command above, on most systems, displays the HTML contents of www.example.com in plain text on the active terminal window. The -o flag can be used to store the output in a file instead:
Ubuntu (/ ʊ ˈ b ʊ n t uː / ⓘ uu-BUUN-too) [8] is a Linux distribution derived from Debian and composed mostly of free and open-source software. [9] [10] [11] Ubuntu is officially released in multiple editions: Desktop, [12] Server, [13] and Core [14] for Internet of things devices [15] and robots.
The download count is a color-coded badge, with special color designations for surpassing certain app download milestones, including grey for 100, 500, 1,000, and 5,000 downloads, blue for 10,000 and 50,000 downloads, green for 100,000 and 500,000 downloads, and red/orange for 1 million, 5 million, 10 million, and 1 billion downloads. [65] [66]
In Raspberry Pi OS the overclocking options on boot can also be made by a software command running "sudo raspi-config" on Raspberry Pi 1, 2, and original 3B without voiding the warranty. [89] In those cases the Pi automatically shuts the overclocking down if the chip temperature reaches 85 °C (185 °F); an appropriately sized heat sink is ...