Crucial Exams

CompTIA Linux+ XK0-006 (V8) Practice Question

A system administrator is writing a script that creates a daily backup. The script must use the path from the BACKUP_TARGET environment variable. If BACKUP_TARGET is unset or empty, the script should use /var/backups as the target for that command only, without permanently changing the variable. Which of the following commands correctly achieves this?

  • cp /var/log/app.log "(\({BACKUP_TARGET:-/var/backups})/app-\)(date +%F).log"

  • cp /var/log/app.log "\((\){BACKUP_TARGET:-/var/backups})/app-$(date +%F).log"

  • cp /var/log/app.log "\({BACKUP_TARGET:=/var/backups}/app-\)(date +%F).log"

  • cp /var/log/app.log "\({BACKUP_TARGET:-/var/backups}/app-\)(date +%F).log"

CompTIA Linux+ XK0-006 (V8)
Automation, Orchestration, and Scripting
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