Shell script to generate sequence number up to 10 million.

[Gulam Mohiuddin]

Hi all,

I need a shell script to create a file with the serial number starting from 1 to 10 million in the following format.

1, XXX, YYY
2, XXX, YYY
3, XXX, YYY
.
.
.
10 million.

We have filesystem with large file enabled, so big flat file shouldn’t be a problem.

Thanks for you anticipated help in advance.

Gulam.

[A. Clay Stephenson]

#!/usr/bin/sh

typeset -i I=1
typeset -i STOP=10000000

while [[ ${I} -le ${STOP} ]]
do
echo "${I},XXX,YYY"
((I += 1))
done

Just redirect stdout to a file and you are done.

[Fred Ruffet]

#!/bin/sh

count=0
while [ $count -lt 1000000 ]
do
count=$(($count+1))
echo $count >> myFile
done

---

This will create myFile file with sequence 1 to 10000000. I guess it won't need largefiles to be enabled :)

Regards,

Fred

[H.Merijn Brand (procura · Accepted solution]

# perl -le'print"$_,XXX,YYY"for 1..10_000_000' >file

Enjoy, Have FUN! H.Merijn

[baiju_3]

Stepehneson ,

Can I ask you one thing , what is difference between

typeset var=100
var=100

Thanks
BL.

[A. Clay Stephenson]

typeset var=100
and
var=100
is not a pericularly good example because the default variable type is string
but

typeset -i var=100
and
var=100

are quite different.

The typeset -i lets the interpreter know that ${i} is an integer value so that optimized arithmatic operations can be done.
Besides, typesetting is simply good discipline. It's especially good in functions because you can now have real local variables that don't conflict with other variables of the same name.