[SOLVED] Lenght of a number?

ashok.g · 12-10-2009, 12:01 AM

How can I get the lenght of a number?For example if my number is 123456789 I should get the output as 9.

GrapefruiTgirl · 12-10-2009, 12:10 AM

Assuming the number is a string variable (or for this purpose, make it one), the length of a string can be found using the echo ${#variable} syntax. Check the bash man page for this and many other neat string things

shell$ man bash

Sasha

gaurav1086 · 12-10-2009, 12:16 AM

Quote:

Originally Posted by ashok.g

How can I get the lenght of a number?For example if my number is 123456789 I should get the output as 9.

hello . use a perl one-liner in your script as

Code:

perl -wln -e 'print length($_);

or

num=$(echo $number |  perl -wln -e 'print length($_);)

there you go
regards.

ghostdog74 · 12-10-2009, 12:31 AM

Quote:

Originally Posted by ashok.g

How can I get the lenght of a number?For example if my number is 123456789 I should get the output as 9.

Code:

$ number=123456789
$ length=${#number}
$ echo $length

ghostdog74 · 12-10-2009, 12:33 AM

Quote:

Originally Posted by gaurav1086

hello . use a perl one-liner in your script as

Code:

perl -wln -e 'print length($_);

or

num=$(echo $number |  perl -wln -e 'print length($_);)

there you go
regards.

that's one of the many ways, but calling an external command is unnecessary and adds overhead.

ashok.g · 12-10-2009, 12:49 AM

Quote:

Originally Posted by ghostdog74

Code:

$ number=123456789
$ length=${#number}
$ echo $length

Here I am getting the output as :

Code:

bash: ${#$n}: bad substitution

urban.yoga.journeys · 12-10-2009, 12:54 AM

Code:

mo@mo-laptop:~/python$ number=12345
mo@mo-laptop:~/python$ length=${#number}
mo@mo-laptop:~/python$ echo $length
5

should work.....

catkin · 12-10-2009, 12:59 AM

Quote:

Originally Posted by ashok.g

Here I am getting the output as :

Code:

bash: ${#$n}: bad substitution

What were the commands you entered to get that error?

ashok.g · 12-10-2009, 01:00 AM

Quote:

Originally Posted by ashok.g

Here I am getting the output as :

Code:

bash: ${#$n}: bad substitution

Sorry, I used some wrong statement.

It's all working fine. I am getting the desired output.

Anisha Kaul · 12-10-2009, 02:58 AM

There is one more way to do it in C:

Go on dividing the number by 10 i.e.

If you divide 1234 by 10, u get the remainder as 4 and quotient as 123.

So what u can do is start a counter which gets incremented each time u get a quotient.

At the end the length of the original number will be counter+1 !