Bash, the Crucial Exams Chat Bot
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CompTIA Linux+ XK0-005 Scripting & Automation Flashcards
| Front | Back |
| How can you check if a variable is empty in Bash | Use '[ -z "$variable" ]' |
| How do you capture the output of a command in a variable in Bash | Use backticks (`command`) or $(command) |
| How do you create a variable in Bash | variable_name=value |
| How do you list all scheduled cron jobs for the current user | crontab -l |
| How do you make a script executable | Use 'chmod +x <script_name>' |
| How do you redirect stderr to a file in Bash | Use '2>' followed by the file name |
| How do you remove a cron job for the current user | Use 'crontab -r' |
| How do you test for equality between two numbers in Bash | Use '[ value1 -eq value2 ]' |
| What command is used to debug a Bash script line-by-line | bash -x <script_name> |
| What does 'source' or '.' do in Bash | It executes a script in the current shell environment |
| What does $0 represent in a Bash script | It represents the name of the script being executed |
| What does the 'read' command do in Bash scripting | It reads user input and assigns it to a variable |
| What does the $? variable represent in Bash | It holds the exit status of the last executed command |
| What is cron syntax format | minute hour day month day_of_week command |
| What is the default shell environment variable that holds the user's path | PATH |
| What is the function of the 'export' command | To make an environment variable available to child processes |
| What is the purpose of 'set -e' in a Bash script | It exits the script if any command fails |
| What is the purpose of a shebang (#!) at the beginning of a script | It specifies the interpreter to execute the script. |
| What is the purpose of the 'trap' command in Bash scripting | To catch signals and execute commands when they occur |
| What operator is used to append output to a file | >> |
| What tool provides a simplified method for creating scheduled jobs in a human-readable format | Anacron |
| What variable is used to store the number of arguments passed to a script | $# |
| Which command is used to schedule a one-time task | at |
| Which command is used to schedule tasks on Linux | cron or at |
Front
How do you redirect stderr to a file in Bash
Click the card to flip
Back
Use '2>' followed by the file name
Front
What command is used to debug a Bash script line-by-line
Back
bash -x <script_name>
Front
How do you test for equality between two numbers in Bash
Back
Use '[ value1 -eq value2 ]'
Front
How do you capture the output of a command in a variable in Bash
Back
Use backticks (`command`) or $(command)
Front
What operator is used to append output to a file
Back
>>
Front
What tool provides a simplified method for creating scheduled jobs in a human-readable format
Back
Anacron
Front
What does the 'read' command do in Bash scripting
Back
It reads user input and assigns it to a variable
Front
What is the purpose of the 'trap' command in Bash scripting
Back
To catch signals and execute commands when they occur
Front
How do you make a script executable
Back
Use 'chmod +x <script_name>'
Front
What does the $? variable represent in Bash
Back
It holds the exit status of the last executed command
Front
How can you check if a variable is empty in Bash
Back
Use '[ -z "$variable" ]'
Front
What does 'source' or '.' do in Bash
Back
It executes a script in the current shell environment
Front
How do you create a variable in Bash
Back
variable_name=value
Front
What is the purpose of a shebang (#!) at the beginning of a script
Back
It specifies the interpreter to execute the script.
Front
Which command is used to schedule tasks on Linux
Back
cron or at
Front
What is cron syntax format
Back
minute hour day month day_of_week command
Front
How do you remove a cron job for the current user
Back
Use 'crontab -r'
Front
What is the purpose of 'set -e' in a Bash script
Back
It exits the script if any command fails
Front
How do you list all scheduled cron jobs for the current user
Back
crontab -l
Front
What is the default shell environment variable that holds the user's path
Back
PATH
Front
What does $0 represent in a Bash script
Back
It represents the name of the script being executed
Front
Which command is used to schedule a one-time task
Back
at
Front
What variable is used to store the number of arguments passed to a script
Back
$#
Front
What is the function of the 'export' command
Back
To make an environment variable available to child processes
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This deck explores bash scripting fundamentals, automation techniques, scheduled tasks, environment variables, and script debugging methods required for the Linux+ certification.