LFCS Essential Commands Practice Question
A user wants to find the location of the 'grep' binary. Which command should they use?
⚠ Common exam trap
Many candidates confuse documentation commands (man) or system information commands (uname) with binary location commands, or mistakenly think a recursive grep search is an efficient way to find a binary, when 'which' is the standard, straightforward tool for this task.
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
which grep
The 'which' command is specifically designed to locate the binary (executable) of a command by searching the directories listed in the user's PATH environment variable. Option B, 'which grep', will output the full path to the grep binary, such as '/usr/bin/grep', directly answering the user's request.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
man grep
Why it's wrong here
Displays the manual page, not location.
- ✓
which grep
Why this is correct
Displays the full path of the grep command.
- ✗
uname -a
Why it's wrong here
Shows system information, not command location.
- ✗
grep -r 'grep' /usr/bin
Why it's wrong here
Searches for string in files, not location.
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JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This LFCS practice question is part of Courseiva's free Linux Foundation certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the LFCS exam.