Keentune
Adaptive skill practice — find your level, get sharper.

Bash & Shell practice

Predict what a shell one-liner prints
Master the command line by predicting what pipelines print — echo/printf piped through the text toolkit (sort, uniq, wc, cut, tr, grep, head/tail, rev, seq), shell arithmetic with $(( )), and parameter expansion. Every answer is computed by running the command, so the explanations are exact. Output-prediction over deterministic, side-effect-free one-liners that builds real shell fluency. Part of the Developer track.
• Meets you at your level — never too easy, never too hard.
• Adapts every question to how you’re doing.
• Tracks your level over time. Skill practice, not a test.
New here? Read the Bash & Shell guide
A free 17-minute primer — the mental model, the mistakes beginners make, and what to practise first.
Curriculum
218 concepts across 22 chapters, from foundations through advanced practice — each one a concept the adaptive question bank can teach and test.
A. What the shell is, and how a script runs
9
B. Quoting
9
C. Simple commands, pipelines and lists
9
D. The expansion order, and word splitting
11
E. Parameter expansion operators
14
F. Parameters, variables and attributes
11
G. Command and process substitution
8
H. Arithmetic evaluation
10
I. Filename expansion and pattern matching
10
J. Redirection and file descriptors
12
K. Here-documents and here-strings
6
L. Conditional expressions: test, [ and [[
11
M. Compound commands and control flow
11
N. Shell functions and scoping
10
O. Arrays and associative arrays
11
P. Exit status and error handling
13
Q. Signals and traps
9
R. Job control and processes
9
S. Shell options: set and shopt
8
T. Invocation, startup files and the environment
8
U. The builtins that carry scripts
11
V. Portability: bash versus POSIX sh
8
View the full curriculum →
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