operating systems Online Quiz - 21

The 'stat' command displays detailed file status information including permissions, size, ownership, timestamps, and inode details. 'cat meminfo' would display memory info, not file status. 'file ' shows file type, not comprehensive status. 'All the above' is incorrect since only one option is correct.

The sh command directly reads and executes the script file contents without requiring the execute permission bit to be set. Only direct execution (./script.sh) requires execute permissions. You can run any shell script with 'sh scriptname' regardless of its permission settings.

In Unix/Linux systems, the default permission for a newly created directory is 755 (rwxr-xr-x). This means owner has read, write, execute permissions, while group and others have read and execute. This is standard because directories need execute permission to allow traversal (cd into them).

The default permission for a regular file in Unix/Linux is 644 (rw-r--r--), not 655. The 644 setting means owner has read/write, group and others have read-only. The umask typically defaults to 022, which subtracts from 666 to yield 644.

When a child process is created via fork(), it starts as an exact duplicate of the parent process - same memory image, program counter, file descriptors, and execution state. While exec() can replace this with a different program, the fork() itself creates an identical copy.

Android was originally developed by Android Inc., founded by Andy Rubin, Rich Miner, Nick Sears, and Chris White. Google acquired Android Inc. in 2005, making Google the acquirer rather than the original inventor.

Android versions are famously named after sweet treats and pastries in alphabetical order: Cupcake, Donut, Eclair, Froyo, Gingerbread, Honeycomb, Ice Cream Sandwich, Jelly Bean, KitKat, Lollipop, Marshmallow, Nougat, Oreo, Pie, and versions 10+ using numbers.

Donut (1.6), Eclair (2.0-2.1), and Froyo (Frozen Yogurt, 2.2) are all actual Android version names. Croissant is the only option that was never used as an Android version name.

The HTC Dream (also known as T-Mobile G1 in the US) was the first commercially available smartphone to run Android, released in September 2008. The Motorola Droid came later in 2009, and Nexus One in 2010.

Android 2.3 was indeed codenamed Gingerbread, continuing the tradition of naming versions after sweet treats. This version introduced features like NFC support and improved UI.

Google acquired Android Inc. in July 2005 for an estimated $50 million. Although the phrasing 'in' usually suggests a year or date, the options represent acquisition costs, making the $50 million option the only historically accurate choice.

The Android operating system codebase consists of approximately 12 million lines of code, reflecting its complexity as a comprehensive mobile platform that includes the Linux kernel, libraries, runtime, and application framework.