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implement the following components as defined below. This means that the individual group member responsible for each portion MUST commit in GitLab the code that supports their responsible area. • Built-In Commands Every shell needs to support several built-in commands, which are functions in the shell itself, not external programs. Shells directly make system calls to execute built-in commands, instead of forking a child process to handle them. Each group member is expected to implement 1 of the following built-in commands. Note that the expectation for this assignment assumes that a group contains 4 students, but if, for some reason, a team has only 3 students, then only 3 of the following built-in commands would need to be supported (i.e., 1 for each group member). 1. Add a new built-in cd command that accepts one optional argument, a directory path, and changes the current working directory to that directory. If no argument is passed, the command will change the current working directory to the user's HOME directory. You may need to invoke the chdir () system call. 2. Add a new built-in exit command that exits from the shell itself with the exit () system call. It is not to be executed like other programs the user types in. If the exit command is on the same line with other commands, you should ensure that the other commands execute (and finish) before you exit your shell. These are all valid examples for quitting the shell: prompt> exit prompt> exit; cat filel prompt> cat filel: exit

implement the following components as defined below. This means that the individual group member responsible for each portion MUST commit in GitLab the code that supports their responsible area. • Built-In Commands Every shell needs to support several built-in commands, which are functions in the shell itself, not external programs. Shells directly make system calls to execute built-in commands, instead of forking a child process to handle them. Each group member is expected to implement 1 of the following built-in commands. Note that the expectation for this assignment assumes that a group contains 4 students, but if, for some reason, a team has only 3 students, then only 3 of the following built-in commands would need to be supported (i.e., 1 for each group member). 1. Add a new built-in cd command that accepts one optional argument, a directory path, and changes the current working directory to that directory. If no argument is passed, the command will change the current working directory to the user's HOME directory. You may need to invoke the chdir () system call. 2. Add a new built-in exit command that exits from the shell itself with the exit () system call. It is not to be executed like other programs the user types in. If the exit command is on the same line with other commands, you should ensure that the other commands execute (and finish) before you exit your shell. These are all valid examples for quitting the shell: prompt> exit prompt> exit; cat filel prompt> cat filel: exit

Database System Concepts
Database System Concepts
7th Edition
ISBN:9780078022159
Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Chapter1: Introduction
Section: Chapter Questions
Problem 1PE
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implement the following components as defined below. This means that the individual group member responsible for each portion MUST commit in GitLab the code that supports their responsible area. • Built-In Commands Every shell needs to support several built-in commands, which are functions in the shell itself, not external programs. Shells directly make system calls to execute built-in commands, instead of forking a child process to handle them. Each group member is expected to implement 1 of the following built-in commands. Note that the expectation for this assignment assumes that a group contains 4 students, but if, for some reason, a team has only 3 students, then only 3 of the following built-in commands would need to be supported (i.e., 1 for each group member). 1. Add a new built-in cd command that accepts one optional argument, a directory path, and changes the current working directory to that directory. If no argument is passed, the command will change the current working directory to the user's HOME directory. You may need to invoke the chdir () system call. 2. Add a new built-in exit command that exits from the shell itself with the exit () system call. It is not to be executed like other programs the user types in. If the exit command is on the same line with other commands, you should ensure that the other commands execute (and finish) before you exit your shell. These are all valid examples for quitting the shell: prompt> exit prompt> exit; cat filel prompt> cat fileli exit
Transcribed Image Text:implement the following components as defined below. This means that the individual group member responsible for each portion MUST commit in GitLab the code that supports their responsible area. • Built-In Commands Every shell needs to support several built-in commands, which are functions in the shell itself, not external programs. Shells directly make system calls to execute built-in commands, instead of forking a child process to handle them. Each group member is expected to implement 1 of the following built-in commands. Note that the expectation for this assignment assumes that a group contains 4 students, but if, for some reason, a team has only 3 students, then only 3 of the following built-in commands would need to be supported (i.e., 1 for each group member). 1. Add a new built-in cd command that accepts one optional argument, a directory path, and changes the current working directory to that directory. If no argument is passed, the command will change the current working directory to the user's HOME directory. You may need to invoke the chdir () system call. 2. Add a new built-in exit command that exits from the shell itself with the exit () system call. It is not to be executed like other programs the user types in. If the exit command is on the same line with other commands, you should ensure that the other commands execute (and finish) before you exit your shell. These are all valid examples for quitting the shell: prompt> exit prompt> exit; cat filel prompt> cat fileli exit
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