A+ Scripting Basics Batch PowerShell and Bash Quiz

The -Force parameter makes many PowerShell cmdlets complete an action without prompting, such as overwriting read-only files or removing items that would normally require confirmation. Confirmation prompts can also be suppressed with -Confirm:$false. NoConfirm, Skip, and Auto are not standard PowerShell parameters, so they would cause an error rather than suppress prompts.

Stop-Service stops a running Windows service by name, for example Stop-Service -Name Spooler to stop the Print Spooler. Its counterparts Start-Service and Restart-Service handle starting and restarting. Stopping a service may require an elevated PowerShell session with administrator rights. Stop-Process ends a running process rather than a service, and Halt-Service and End-Service are not valid PowerShell cmdlets.

In batch scripts, comments start with REM, short for remark, and any text after it on that line is ignored. Many scripts also use a double colon (::) as an informal comment. The # symbol marks comments in PowerShell and Bash, // is used in languages like C and JavaScript, and -- is used in SQL.

The statement is true. The shebang line, written as #! followed by an interpreter path such as /bin/bash, must be the first line of the script. It tells the system which program should run the file when it is executed directly, for example with ./backup.sh, after execute permission has been granted with chmod.

PowerShell uses word-based comparison and logical operators that begin with a hyphen, so logical AND is written as -and, as in if ($a -gt 5 -and $b -lt 10). Similarly, -or and -not handle other logic. In PowerShell 7, && and || only chain commands based on success, and & is the call operator.

The setlocal command starts a local scope for environment variables in a batch script, so any variables created or changed afterward are discarded when the script ends or reaches endlocal. This keeps scripts from leaving stray variables in the user’s session. It does not change time zones, language settings, or create backups.

In Bash test expressions, -e checks whether a file or directory exists, as in if [ -e /etc/hosts ]. The other options test more specific conditions: -f checks for a regular file, -d checks for a directory, and -x checks whether the file is executable. Each of them returns false if the path doesn’t exist.

Get-Help displays documentation for any cmdlet, including its syntax, parameters, and description. Adding -Examples shows sample usage, and -Online opens the full documentation in a browser. Running Update-Help downloads the latest help files. Show-Help, Find-Help, and Help-Command are not real cmdlets, though help works as a built-in shortcut for Get-Help.

The statement is false. Batch scripts reference variables by surrounding the name with percent signs, as in %username% or %path%, and set values with the set command, such as set name=value. Curly braces are used in other languages, including PowerShell script blocks and Bash variable expansion like ${name}, but not for batch variables.

The chmod command changes a file’s permissions, controlling who can read, write, or execute it. For example, chmod +x script.sh makes a script executable, and chmod 755 sets permissions using numeric notation. Ownership is changed with chown, file names with mv, and size changes only when the file’s contents change.

Batch is the native Windows command-line scripting language, saved with .bat or .cmd extensions and run by the cmd.exe interpreter. It has been part of Windows since the MS-DOS era. PowerShell scripts use .ps1, Bash scripts commonly use .sh on Linux and macOS, and Python scripts use .py and require a separately installed interpreter.

Placing @echo off at the top of a batch file stops each command from being displayed in the console as it runs, so users see only the script’s intended output. The echo off part hides later commands, and the @ symbol hides that line itself. It does not stop the script, suppress errors, or delete files.

The statement is false. PowerShell uses different syntax from batch, including $ for variables instead of %var%, different comment markers, and cmdlets instead of many batch commands, so a renamed batch file usually fails. PowerShell can still launch existing .bat files directly, which lets organizations keep older scripts while migrating to PowerShell.

The single greater-than symbol (>) redirects standard output to a file in both batch and Bash, creating the file or overwriting its existing contents, as in dir > list.txt. The double symbol (>>) appends output to the end of the file instead. The pipe passes output to another command, and < redirects input from a file.

The grep command searches files or command output for lines matching a text pattern or regular expression, such as grep error /var/log/syslog. Options like -i ignore case and -r search directories recursively. Grouping by size is not its job, compression uses tools like gzip or tar, and tree displays directory structure.

Get-Process returns a list of processes running on the computer, including names, IDs, and CPU and memory usage, similar to the Processes tab in Task Manager. Get-Service lists Windows services rather than processes. Get-Task and List-Processes are not real cmdlets, even though their names resemble the Verb-Noun format genuine cmdlets use.

The pipe operator sends the output of one command directly into another as input, letting commands be chained together. For example, Get-Process | Sort-Object CPU sorts processes in PowerShell, and ls | grep log filters a listing in Bash. It does not create files, compare files, or redirect only errors.

The echo command displays text in the console, for example echo Backup complete, and is one of the most common batch commands. It is also used as echo off to control command display. Print sends files to a printer in Windows, while write and display are not valid batch commands for console output.

Bash supports a C-style for loop using double parentheses, written as for (( i=0; i < 10; i++ )), followed by do and done. The $i syntax is PowerShell, for i = 1 to 10 is BASIC or VBScript style, and a brace-expansion loop such as for i in {1..10} needs a semicolon or newline before do.

PowerShell variables always begin with a dollar sign, such as $name or $count, and the same symbol is used when assigning and reading values. Batch scripts use percent signs around variable names, as in %name%. The ampersand runs commands in PowerShell, and the at sign is used for arrays, hash tables, and splatting.