Which bash command sequence efficiently extracts all lines containing the word error from system.log and writes them to error_report.txt?

hard🚀 Application Q8 of 15

Bash Scripting - Text Processing in Scripts

Which bash command sequence efficiently extracts all lines containing the word error from system.log and writes them to error_report.txt?

Ased 'error' system.log > error_report.txt

Bcat system.log | grep error > error_report.txt

Cgrep error < system.log >> error_report.txt

Dgrep 'error' system.log > error_report.txt

Step-by-Step Solution

Solution:

Step 1: Identify the correct tool
grep is the standard tool to search for patterns in files.
Step 2: Use proper redirection
Using > overwrites or creates the output file with matching lines.
Step 3: Evaluate options
grep 'error' system.log > error_report.txt uses grep directly with file input and output redirection, which is efficient and clear.
Final Answer:
grep 'error' system.log > error_report.txt -> Option D
Quick Check:
Direct grep with output redirection is simplest and fastest [OK]

Quick Trick: Use grep with output redirection, avoid unnecessary pipes [OK]

Common Mistakes:

MISTAKES

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