11. Utilize Bash Commands (file Management, Directory Navigation, and Environmental Variables) 200-901 Practice Questions (Page 1)

Questions 1–5

1. 1application · medium

   A developer wants to make an API key available to all scripts run by a specific user without having to export it in every terminal session. The developer adds the line 'export API_KEY=abc123' to the user's ~/.bashrc file. What must happen for the variable to be available in a new terminal session?

   • AThe variable is immediately available in all existing sessions.
   • BThe user must source ~/.bashrc or open a new terminal session.
   • CThe variable must also be added to /etc/environment for it to work.
   • DThe system must be rebooted for the change to take effect.
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2. 2application · medium

   A script needs to read a configuration file whose path is stored in an environment variable CONFIG_PATH. The script must print an error and exit if the variable is not set. Which Bash snippet accomplishes this?

   • Aecho $CONFIG_PATH
   • Bexport CONFIG_PATH
   • Cif [ -n "$CONFIG_PATH" ]; then echo 'Error'; exit 1; fi
   • Dif [ -z "$CONFIG_PATH" ]; then echo 'Error'; exit 1; fi
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4. 3expert · hard

   A script is designed to be run from any directory. It needs to locate a data file that is stored in a subdirectory relative to the script's own location. The script currently uses `./data/file.csv`, which fails when the script is invoked from a different directory. Which modification makes the script robust?

   • AUse the environment variable `$PWD` to construct the path.
   • BUse `SCRIPT_DIR=$(cd "$(dirname "$0")" && pwd)` and then reference `"$SCRIPT_DIR/data/file.csv"`.
   • CHard-code the absolute path `/opt/scripts/data/file.csv`.
   • DChange the script to `cd $(dirname "$0")` at the beginning.
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5. 4expert · hard

   A script is designed to be run from any directory. It needs to locate a configuration file that is stored in a subdirectory relative to the script's own location. The script is located at /opt/scripts/deploy.sh, and the config is at /opt/scripts/config/app.conf. Which command inside the script correctly references the config file regardless of the current working directory?

   • ACONFIG_DIR="$PWD/config"
   • BCONFIG_DIR="$(dirname "$0")/config"
   • CCONFIG_DIR="/opt/scripts/config"
   • DCONFIG_DIR="./config"
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6. 5application · medium

   A script must create a directory named 'logs' inside the current directory only if it does not already exist, and then change into it. Which command sequence achieves this?

   • Amkdir logs ; cd logs
   • Bmkdir logs && cd logs
   • Ccd logs || mkdir logs
   • Dmkdir -p logs && cd logs
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