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Expect is an extension to the Tcl scripting language written by Don Libes. [2] The program automates interactions with programs that expose a text terminal interface. Expect, originally written in 1990 for the Unix platform, has since become available for Microsoft Windows and other systems.
Support for command history means that a user can recall a previous command into the command-line editor and edit it before issuing the potentially modified command. Shells that support completion may also be able to directly complete the command from the command history given a partial/initial part of the previous command.
A web shell is a shell-like interface that enables a web server to be remotely accessed, often for the purposes of cyberattacks. [1] A web shell is unique in that a web browser is used to interact with it. [2] [3] A web shell could be programmed in any programming language that is supported on a server.
One of the problems with the script command is that it only allows logging of a child process; and often there is a need to log the command in the current process without spawning a new process, such as when automation of a script is needed that can log its own output. The Unix operating systems make this possible by use of pipes and redirects ...
Previously (and in fact still) the shell did much of this job; it automatically executed itself on a text file with executable mode when the text file's name was typed as a command. Putting the facility into the system gives the following benefits. 1) It makes shell scripts more like real executable files, because they can be the subject of 'exec.'
A child process in computing is a process created by another process (the parent process).This technique pertains to multitasking operating systems, and is sometimes called a subprocess or traditionally a subtask.
For the shell's purposes, a command which exits with a zero exit status has succeeded. A nonzero exit status indicates failure. This seemingly counter-intuitive scheme is used so there is one well-defined way to indicate success and a variety of ways to indicate various failure modes.
The spawn() family of functions declared in process.h can replace it in cases where the call to fork() is followed directly by exec(). When a fork syscall is made on WSL, lxss.sys does some of the initial work to prepare for copying the process. It then calls internal NT APIs to create the process with the correct semantics and create a thread ...