Bash script to generate random ascii lines whose lengths are also random but within the range 'min_line_len' - 'max_line_len'.

[Amit]

Bash script to generate random ascii lines whose lengths are also
random but within the range 'min_line_len' - 'max_line_len'.

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generate_random_ascii_lines_having_randon_lengths_within_a_range.sh
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#!/bin/bash

# Author: Amit Choudhary
# Email: amitchoudhary0523 AT gmail DOT com

#
# Description: This bash script generates random ascii lines whose lengths are
#              also random but within the range 'min_line_len' - 'max_line_len'.
#
# Example usage:
#       ./generate_random_ascii_lines_having_randon_lengths_within_a_range.sh
#

min_line_len=8000
max_line_len=30000
let "modulus = max_line_len - min_line_len + 1"
#echo "DEBUG: modulus = $modulus"

lines_curr_count=0
total_lines_to_print=100

while [ "$lines_curr_count" -lt "$total_lines_to_print" ]; do

    let "curr_line_len = min_line_len + (RANDOM % modulus)"

    #echo "DEBUG: Length of line to create = $curr_line_len"

    line=""

    # The following has to be done because the terminal restricts the input of
    # any command (here, it is "dd" command) to only 4096 characters (including
    # new line character). So, to circumvent this restriction, the following has
    # been done the way it has been done.
    while [ "$curr_line_len" -gt 4000 ]; do
        temp=`tr -dc '[:print:]' < /dev/urandom | dd ibs=4000 count=1 \
             status=none;`
        line=$line$temp
        let "curr_line_len-=4000"
    done

    #echo "DEBUG: Length of line 'remaining' to create = $curr_line_len"

    if [ "$curr_line_len" -gt 0 ]; then
        temp=`tr -dc '[:print:]' < /dev/urandom | dd ibs=$curr_line_len \
             count=1 status=none;`
        line=$line$temp
    fi

    #echo "DEBUG: Length of line = ${#line}"

    echo $line

    let "lines_curr_count++"

done

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