How to write a bash script to generate a file named inputFile with comma separated values with index and a random number

Question

Can someone help on how to write an bash script to generate a file named inputFile whose content looks like:

These are comma separated values with index and a random number.

Running the script without any arguments, should generate the file inputFile with 10 such entries in current directory.

You should be able to extend this script to generate any number of entries, for example 100000 entries.

I tried below script, But its not as expectation could someone help to fix this as I am new to scripting?

RANDOM=$$
num=0

while [[ ${num} -le $1 ]]
do
    echo $num $RANDOM
    (( num = num +1 ))
done

Say bash script csv.sh, It should generate a file named inputFile whose content looks like. 0, 334 1, 933 2, 34123 3, 123 4, 12345 5, 6783 Running the script without any arguments, should generate the file inputFile with 10 such entries in current directory also we should be able to extend this script to generate any number of entries, for example 100000 entries. This is requirement ! — Naveen NK
– Naveen NK, Commented Nov 18, 2022 at 5:15
Please update/edit your question to reflect such requirement, not here in the comment section, so others can read everything also. — Jetchisel
– Jetchisel, Commented Nov 18, 2022 at 5:29

M. Nejat Aydin · Accepted Answer · 2022-11-18 06:38:44Z

1

Use a C-style for loop in bash:

#!/bin/bash

n=10
for ((i=0; i<n; ++i)); do
    echo "$i,$RANDOM"
done > inputFile

Modify the n=10 as needed.
Alternatively, using a while loop:

#!/bin/bash

n=10
i=0
while ((i<n)); do
    echo "$((i++)),$RANDOM"
done > inputFile

answered Nov 18, 2022 at 6:17

M. Nejat Aydin

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