When a user issues the following distinct commands, what happens and why? Assume all files exist. ### Transcription of Shell Commands#### A. `$ CTRL-Z`- This command sequence is used in a Unix shell to suspend a currently running foreground process.#### B. `$ PATH=$PATH:~/mybin`- This command updates the `PATH` environment variable to include a directory named `mybin` located in the user's home directory.#### C. `$ echo $?`- This command prints the exit status of the last executed command. A status of `0` usually means the command was successful.#### D. `$ wc filexx > filexx`- This command uses `wc` (word count) to count the lines, words, and bytes in the file `filexx`, and then redirects the output to overwrite `filexx`. **Note:** This can result in data loss as it overwrites the file with its own metadata.#### E. `$ cp -i fileCC fileDD`- This command copies the file `fileCC` to `fileDD`. The `-i` option prompts the user before overwriting `fileDD`.These commands are useful for understanding basic shell operations and command-line tools.

A. $ CTRL -Z B. $ PATH=$PATH:-/mybin C. $ echo $? D. $ wc filexx > filexx E. $cp -i…

Answered: When a user issues the following…

Engineering

Computer Science

When a user issues the following distinct commands, what happens and why? Assume all files exist.

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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An operating system (OS) is the software which manages hardware and resources, like CPU, storage and memory. The OS bridges the applications and hardware and makes the connections between all of your software and the hardware resources.

Question

When a user issues the following distinct commands, what happens and why? Assume all files exist.

### Transcription of Shell Commands

#### A. `$ CTRL-Z`
- This command sequence is used in a Unix shell to suspend a currently running foreground process.

#### B. `$ PATH=$PATH:~/mybin`
- This command updates the `PATH` environment variable to include a directory named `mybin` located in the user's home directory.

#### C. `$ echo $?`
- This command prints the exit status of the last executed command. A status of `0` usually means the command was successful.

#### D. `$ wc filexx > filexx`
- This command uses `wc` (word count) to count the lines, words, and bytes in the file `filexx`, and then redirects the output to overwrite `filexx`. **Note:** This can result in data loss as it overwrites the file with its own metadata.

#### E. `$ cp -i fileCC fileDD`
- This command copies the file `fileCC` to `fileDD`. The `-i` option prompts the user before overwriting `fileDD`.

These commands are useful for understanding basic shell operations and command-line tools.

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