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AppImage (formerly known as klik and PortableLinuxApps) is an open-source format for distributing portable software on Linux.It aims to allow the installation of binary software independently of specific Linux distributions, a concept often referred to as upstream packaging.
A common value is /bin/sh, but some systems such as Solaris have the POSIX-compatible shell at /usr/xpg4/bin/sh. [13] In many Linux systems, /bin/sh is a hard or symbolic link to /bin/bash, the Bourne Again shell (BASH). Using bash-specific syntax while maintaining a shebang pointing to sh is also not portable. [14]
When a Linux system is powered up or reset, its processor will execute a specific firmware/program for system initialization, such as the power-on self-test, invoking the reset vector to start a program at a known address in flash/ROM (in embedded Linux devices), then load the bootloader into RAM for later execution. [2]
The base of each is exec (execute), followed by one or more letters: e – An array of pointers to environment variables is explicitly passed to the new process image. l – Command-line arguments are passed individually (a list) to the function. p – Uses the PATH environment variable to find the file named in the file argument to be executed.
Created in 1989 [8] by Brian Fox for the GNU Project, it is supported by the Free Software Foundation and designed as a 100% free alternative for the Bourne shell (sh) and other proprietary Unix shells. [9] Since its inception, Bash has gained widespread adoption and is commonly used as the default login shell for numerous Linux distributions. [10]
tcsh and sh shell windows on a Mac OS X Leopard [1] desktop A Unix shell is a command-line interpreter or shell that provides a command line user interface for Unix-like operating systems . The shell is both an interactive command language and a scripting language , and is used by the operating system to control the execution of the system ...
The Bourne shell (sh) is a shell command-line interpreter for computer operating systems. It first appeared on Version 7 Unix , as its default shell . Unix-like systems continue to have /bin/sh —which will be the Bourne shell, or a symbolic link or hard link to a compatible shell—even when other shells are used by most users.
A shell script is a computer program designed to be run by a Unix shell, a command-line interpreter. [1] The various dialects of shell scripts are considered to be command languages . Typical operations performed by shell scripts include file manipulation, program execution, and printing text.