You want to find and rerun a command that contains the word backup anywhere in it, but you don't remember the exact command start. Which is the best way to do this?

hard📝 Application Q15 of 15

Linux CLI - Environment and Configuration

You want to find and rerun a command that contains the word backup anywhere in it, but you don't remember the exact command start. Which is the best way to do this?

APress <code>Ctrl + r</code> and type 'backup' to search interactively

BUse <code>!backup</code> to rerun the command

CRun <code>history | grep backup</code> and then rerun manually

DUse <code>!! backup</code> to rerun last backup command

Step-by-Step Solution

Solution:

Step 1: Understand searching commands with unknown start
!string only matches commands starting with string, so !backup won't find commands containing 'backup' elsewhere.
Step 2: Identify interactive search method
Ctrl + r lets you search history interactively for any substring, including 'backup'.
Final Answer:
Press Ctrl + r and type 'backup' to search interactively -> Option A
Quick Check:
Use Ctrl + r for substring history search [OK]

Quick Trick: Use Ctrl + r to search history by any word quickly [OK]

Common Mistakes:

Assuming !backup matches anywhere in command
Trying !! backup which is invalid syntax
Relying only on grep without rerun shortcut

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You want to find and rerun a command that contains the word backup anywhere in it, but you don't remember the exact command start. Which is the best way to do this?

Step 1: Understand searching commands with unknown start

Step 2: Identify interactive search method

Final Answer:

Quick Check:

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