[Solved] Given the history output: 200 ls 201 cd /var/log 202 tail syslog 203 ls -l 204 grep error syslogWhat command will rerun the last command starting with ls? | Linux CLI

Linux CLI - Environment and Configuration

Given the history output:

  200  ls
  201  cd /var/log
  202  tail syslog
  203  ls -l
  204  grep error syslog

What command will rerun the last command starting with ls?

A!ls

B!200

C!ls -l

D!204

Step-by-Step Solution

Solution:

Step 1: Understand history event designators
Using !ls reruns the most recent command starting with 'ls'.
Step 2: Check other options
!200 reruns command number 200 ('ls'), but not the most recent starting with 'ls'; !ls -l is invalid syntax (expands to ls -l -l); !204 reruns command 204 which starts with grep.
Final Answer:
!ls -> Option A
Quick Check:
Rerun last command starting with 'ls' = !ls [OK]

Quick Trick: Use !prefix to rerun last command starting with prefix [OK]

Common Mistakes:

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