#!/bin/bash
N="$1"
D="$2"
K="$3"
ID="$4"

if [ -z "$N" ] || [ -z "$D" ] || [ -z "$K" ] || [ -z "$ID" ]; then
echo "Usage of : $0 <N> <D> <K> <ID> Please provide proper arguments."
exit 1
fi

folder_name="cs527_lab1_test_$ID"
normal_file_count=0
folder_count=0
max_depth=$D
max_levels=0

function create_files_and_subfolders {
local current_folder="$1"
local depth="$2"
if [ "$depth" -gt "$max_levels" ]; then
max_levels="$depth"
fi
L=$N
for ((i = 1; i <= L; i++)); do
file_type=$((RANDOM % 2))
if [ $file_type -eq 0 ] && [ "$depth" -le $max_depth ]; then
folder_count=$((folder_count + 1))
mkdir "$current_folder/dir$i"
((depth++))
create_files_and_subfolders "$current_folder/dir$i" "$((depth))"
else
normal_file_count=$((normal_file_count + 1))
file_path="$current_folder/file$i.txt"
touch "$file_path"
max_chars=$((1024 * K))
text_length=$((RANDOM % (max_chars + 1)))
random_text=$(head /dev/urandom | tr -dc 'a-zA-Z0-9' | head -c "$text_length")
echo "$random_text" > "$file_path"
fi
done
}

if [ -d "$folder_name" ]; then
rm -rf "$folder_name"
fi
mkdir "$folder_name"
create_files_and_subfolders "$folder_name" 1
readme_file="$folder_name/readme.txt"
echo "Total normal files $((normal_file_count + 1))" >> "$readme_file"
echo "Total folders $folder_count" >> "$readme_file"
echo "Maximum levels $max_levels" >> "$readme_file"

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About Bash

Bash (Bourne Again Shell) is a shell program written by Brian Fox and is an upgraded version of Bourne Shell program 'sh'.

Features

  • Open source GNU project
  • Read and execute the commands from a Shell Script
  • Can be invoked by either single-character command line options (-a, -b, -c, -i, -l, -r, etc. ) or by multi-character command line options also like --help, --debugger,--login, etc.
  • Consists of Key bindings
  • Available in restricted mode for the environment security
  • Contains one-dimensional arrays to manipulate the lists of data.

Syntax help

Variables

name="Foo"
echo $name
echo "$name"
echo "${name}"

Conditional Statements

If

if [ conditional-expression ]  
then  
statements  
fi

If-else

if [ conditional-expression ]  
then  
   statements  
else  
  statements
fi

Else-If

if [ conditional-expression ]  
then  
   statements  
elif [ conditional-expression ]  
then  
 statements  
else  
  statements
fi