Visualization support (bash)

Try it here [https://8gwifi.org/online-bash-compiler/](https://8gwifi.org/online-bash-compiler/)

# Tracers

`CodeTracer`, `Array1DTracer`, `MapTracer`, `CallStackTracer`, `LogTracer`

# Supported

* **Variables & scope** — x=5, local n=1, declare -i c, readonly MAX, export ENV split into globals vs current-frame locals panels; locals clear when the function returns; integer/readonly/exported shown as badges
* **Arrays** — arr=(a b c), arr+=(x), arr\[i\]=v build, grow, index, sort in place
* **Associative arrays (maps)** — declare -A m, m\[key\]=val, ((m\[$w\]++)) counting, grouping, config maps
* **Loops** — for x in ..., for ((i=0;i<n;i++)), while, until line highlights each iteration; loop var + body vars update per pass
* **Functions & recursion** — name() { ... }, local v=..., direct recursive calls call stack push/pop per call
* **Positional parameters** — $1..$9, $#, $@ (for x in "$@") script args (viz \`args\` field) populate $1..$@ at top level; a function's args shown per call (recursion shows each frame); $#=0 when none
* **Exit status ($?)** — grep x file, (( n > 10 )), ((count++)) panel appears on first non-zero; tracks failing commands and false (( ))/\[\[ \]\] tests (incl. the classic ((i++)) from 0 returning 1)
* **Output** — echo, printf shown next to the command that printed it

# Not supported yet

* **Pipelines a|b, command substitution $(...), subshells ( ), background &** — Each forks a child shell whose variables can't report back; only the main shell is traced. So recursion written as v=$(f) won't show — call the function directly. *Use instead: Planned Track B shell-model visualizer (process tree, redirection, expansion order)*
* **Parameter/string expansion (${x#pre}, ${x/a/b}, ${#x}, ${x:-def}), $PIPESTATUS, redirection & FD rewiring, traps / set -e flow** — Track A shows the resulting variable state, not the expansion/process/IO model; variable reads aren't highlighted (bash has no embeddable source rewriter) *Use instead: Track B*

Online Bash Shell – Run/Learn Bash Scripts Online with Vis Support