On Unix systems, processes have access to environment variables that can influence the behavior of programs. The global variable environ, declared as extern char **environ; points to an array of pointers to strings. The last pointer has the value NULL. By convention, the strings have the form "name=value" and the names are often written using uppercase characters. Examples of environment variables are USER (the name of the current user), HOME (the current user's home directory), or PATH (the colon-separated list of directories where the system searches for executables). Write a program env that implements some of the functionality of the standard env program. The syntax of the command line arguments is the following: env [OPTION]... [NAME=VALUE]... [COMMAND [ARG]...] a) If called without any arguments, env prints the current environment to the standard output.
On Unix systems, processes have access to environment variables that can influence the behavior of programs. The global variable environ, declared as extern char **environ; points to an array of pointers to strings. The last pointer has the value NULL. By convention, the strings have the form "name=value" and the names are often written using uppercase characters. Examples of environment variables are USER (the name of the current user), HOME (the current user's home directory), or PATH (the colon-separated list of directories where the system searches for executables). Write a program env that implements some of the functionality of the standard env program. The syntax of the command line arguments is the following: env [OPTION]... [NAME=VALUE]... [COMMAND [ARG]...] a) If called without any arguments, env prints the current environment to the standard output.
Computer Networking: A Top-Down Approach (7th Edition)
7th Edition
ISBN:9780133594140
Author:James Kurose, Keith Ross
Publisher:James Kurose, Keith Ross
Chapter1: Computer Networks And The Internet
Section: Chapter Questions
Problem R1RQ: What is the difference between a host and an end system? List several different types of end...
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![On Unix systems, processes have access to environment variables that can influence the behavior
of programs. The global variable environ, declared as
extern char **environ;
points to an array of pointers to strings. The last pointer has the value NULL. By convention, the
strings have the form "name=value" and the names are often written using uppercase characters.
Examples of environment variables are USER (the name of the current user), HOME (the current
user's home directory), or PATH (the colon-separated list of directories where the system searches
for executables).
Write a program env that implements some of the functionality of the standard env program. The
syntax of the command line arguments is the following:
env [OPTION]... [NAME=VALUE]... [COMMAND [ARG]...]
a) If called without any arguments, env prints the current environment to the standard output.](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F8338ec87-b0cb-4b65-8319-1f0ca3e70dfd%2F9f63eb1e-ae43-40e5-8d65-5bb7eee6b9c1%2Fnka37mi_processed.jpeg&w=3840&q=75)
Transcribed Image Text:On Unix systems, processes have access to environment variables that can influence the behavior
of programs. The global variable environ, declared as
extern char **environ;
points to an array of pointers to strings. The last pointer has the value NULL. By convention, the
strings have the form "name=value" and the names are often written using uppercase characters.
Examples of environment variables are USER (the name of the current user), HOME (the current
user's home directory), or PATH (the colon-separated list of directories where the system searches
for executables).
Write a program env that implements some of the functionality of the standard env program. The
syntax of the command line arguments is the following:
env [OPTION]... [NAME=VALUE]... [COMMAND [ARG]...]
a) If called without any arguments, env prints the current environment to the standard output.
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