Crucial Exams

CompTIA Linux+ XK0-006 (V8) Practice Question

A junior administrator writes the following line in a Bash script to capture the first log file created on the current date that is stored inside a compressed archive:

BACKUP_DIR=`tar -tzf backup.tar.gz | grep "\`date +%F\`" | head -1`

The script fails with a "command not found" error because the inner backticks are parsed too early. Which rewritten command follows POSIX-compliant best practice for nested command substitution and eliminates the escaping problem?

  • BACKUP_DIR=\((tar -tzf backup.tar.gz | grep "\)(date +%F)" | head -1)

  • BACKUP_DIR=tar -tzf backup.tar.gz | grep "$(date +%F)" | head -1

  • BACKUP_DIR=tar -tzf backup.tar.gz | grep "\date +%F`" | head -1 | tr -d '\n'`

  • BACKUP_DIR=$(tar -tzf backup.tar.gz | grep date +%F | head -1)

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