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    <p>This is a script that generate a random dir structure :</p> <pre><code>#!/bin/bash # Decimal ASCII codes (see man ascii) ARR=( {48..57} {65..90} {97..122} ) # Array count arrcount=${#ARR[@]} # return a random string get_rand_dir(){ for ((i=1; i&lt;$((RANDOM%30)); i++)) { printf \\$(printf '%03o' ${ARR[RANDOM%arrcount]}); } } dir=/tmp/ # appending random characters to make a hierarchy for ((i=0; i&lt;$((RANDOM%100)); i++)) { dir+="$(get_rand_dir)/" } echo $dir mkdir -p "$dir" oldir=$(echo "$dir" | cut -d '/' -f1-3) while [[ $dir ]]; do dir=${dir%/*} cd $dir for ((i=0; i&lt;$((RANDOM%100)); i++)) { mkdir &amp;&gt;/dev/null -p $(get_rand_dir) } done tree "$oldir" </code></pre> <p><strong>OUTPUT</strong></p> <pre><code>/tmp/x ├── egeDVPW ├── iOkr ├── l ├── o1gye8uF ├── q │   ├── 4Dlrfagv │   ├── 4Yxmoqf │   ├── 8LkyIrXA │   ├── 8m9kse8s │   ├── aV │   ├── in │   │   ├── 12zdLso68HWlPK │   │   │   ├── C │   │   │   ├── DOYt8wUW │   │   │   ├── FXP │   │   │   ├── hFLem8 │   │   │   ├── hhHIv │   │   │   ├── iD87kxs54x04 │   │   │   ├── oFM │   │   │   ├── OjFT </code></pre> <p>Now you can create an array of dirs :</p> <pre><code>shopt -s globstar # require bash4 dirs=( /tmp/x/** ) printf '%s\n' ${dirs[@]} </code></pre> <p>and populate dirs with files randomly. You have enough examples to do so. I've done the most hard work.</p>
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