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Shellshock, also known as Bashdoor, [1] is a family of security bugs [2] in the Unix Bash shell, the first of which was disclosed on 24 September 2014.Shellshock could enable an attacker to cause Bash to execute arbitrary commands and gain unauthorized access [3] to many Internet-facing services, such as web servers, that use Bash to process requests.
In Linux, if the script was executed by a regular user, the shell would attempt to execute the command rm -rf / as a regular user, and the command would fail. However, if the script was executed by the root user, then the command would likely succeed and the filesystem would be erased. It is recommended to use sudo on a per-command basis instead.
On Unix-like platforms, usage messages usually follow the same common pattern: They often begin with "Usage:" , the command, followed by a list of arguments.; To indicate optional arguments, square brackets are commonly used, and can also be used to group parameters that must be specified together.
The range header is used by HTTP clients to enable resuming of interrupted downloads, or split a download into multiple simultaneous streams. 207 Multi-Status (WebDAV; RFC 4918) The message body that follows is by default an XML message and can contain a number of separate response codes, depending on how many sub-requests were made.
Allows a command to continue running after logging out nproc: Queries the number of (active) processors pathchk: Checks whether file names are valid or portable pinky: A lightweight version of finger: printenv: Prints environment variables: printf: Formats and prints data pwd: Prints the current working directory: readlink: Displays value of a ...
Editing a FreeBSD shell script for configuring ipfirewall. 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 ...
Used to prevent stand-alone execution of a script file intended for execution in a specific context, such as by the . command from sh/bash, source from csh/tcsh, or as a .profile, .cshrc, or .login file. Shebang lines may include specific options that are passed to the interpreter.
The Linux enhanced version of getopt has the extra safety of getopts plus more advanced features. It supports long option names (e.g. --help) and the options do not have to appear before all the operands (e.g. command operand1 operand2 -a operand3 -b is permitted by the Linux enhanced version of getopt but does not work with getopts).