What this snippet does
-i.bak rewrites the file and keeps the original alongside it.
Why practise typing this
Typing text processing code builds muscle memory for the symbols and indentation Linux uses most, which prose-based typing tests never cover. DevType measures your words per minute and accuracy on this snippet and tracks the individual characters you mistype, so later lessons can target them.
More Linux practice
- Searching a fileText Processing · beginner
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- Substituting textText Processing · intermediate