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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.
#! /bin/sh – Execute the file using the Bourne shell, or a compatible shell, assumed to be in the /bin directory #! /bin/bash – Execute the file using the Bash shell #! /usr/bin/pwsh – Execute the file using PowerShell #! /usr/bin/env python3 – Execute with a Python interpreter, using the env program search path to find it
Bash can execute the vast majority of Bourne shell scripts without modification, with the exception of Bourne shell scripts stumbling into fringe syntax behavior interpreted differently in Bash or attempting to run a system command matching a newer Bash builtin, etc. Bash command syntax includes ideas drawn from the Korn Shell (ksh) and the C ...
The interpreter would execute one of a number of predefined commands, one of which would be to run a user program. Common commands would log the user on and off the system, allocate, free, and manipulate devices and files, and query various pieces of information about the system or a user process. [7]
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 ...
On Unix systems, the execute permission controls access to invoking the file as a program, and applies both to executables and scripts. As the permission is enforced in the program loader , no obligation is needed from the invoking program, nor the invoked program, in enforcing the execute permission – this also goes for shells and other ...
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.
Changes the permissions of a file or directory cp: Copies a file or directory dd: Copies and converts a file df: Shows disk free space on file systems dir: Is exactly like "ls -C -b". (Files are by default listed in columns and sorted vertically.) dircolors: Set up color for ls: install: Copies files and set attributes ln: Creates a link to a ...