Hello sir,

I have a array like this, I need to find number of keys in it.

name[11]="u1"
name[12]="u2"
name[13]="u3"
name[21]="zim1"
name[22]="zim2"
name[31]="zam1"

In above array, I have to find number of keys start with 1 and 2 and 3, in above case it will be 3, 2, 1

The data is changed always, sometimes it is like

name[11]="u1"
name[12]="u2"
name[13]="u3"
name[14]="u4"
name[15]="u5"
name[16]="u6"
name[21]="zim1"
name[22]="zim2"
name[23]="zim3"
name[24]="zim4"
name[25]="zim5"
name[26]="zim6"
name[27]="zim7"
name[28]="zim8"
name[29]="zim9"
name[31]="zam1"
name[32]="zam2"
name[33]="zam3"
name[41]="zam4"
name[42]="zam5"
name[43]="zam6"
name[44]="zam7"
name[45]="zam8"

In this case the number of keys start with 1 are 6, start with 2 are 9, start with 3 are 3 and start with 4 are 5

The values will be changed always but not the name of array and 11,12,13,21,22,23,24.... will be in order.

Please help.

What have you tried? This is a fairly trivial exercise.

I tried
echo ${#name[@]}
But it shows total number of values.

Other things I tried
[admin@localhost]$ echo ${#name[11]}
2
[admin@localhost]$ echo ${#name[12]}
2
[admin@localhost]$ echo ${#name[13]}
2
[admin@localhost]$ echo ${#name[21]}
4
[admin@localhost]$ echo ${#name[31]}
4
[admin@localhost]$ echo ${#name[41]}
4
[admin@localhost]$ echo ${#name[51]}
0

I didnt get correct answer

On the contrary, you got only correct answers.

This might help.
http://www.linuxjournal.com/content/bash-arrays

Is there any way so I can get 6 for start with 1 case?

Google for "bash array list keys"
and you will find that
lists the values, while
lists the keys!

MadeInGermany,
Your examples are the same. It is also known as an index.

1 members found this post helpful.

Really? I can think of several ways to do that, but I wouldn't call any of them "trivial." Simplest I've come up with:Or, doing a bit more in the shell to avoid the wc invocation:

2 members found this post helpful.

Now you have an array indexed with the numbers you are after each with the total you require

So yes, I thought it was fairly trivial.

1 members found this post helpful.

Thanks rknichols for your helpful solution and gratitude atleast you do not think it was trivial.
It solved my issue. Used your code in my loop and adjust little according to my script and it worked like a charm.
Thanks again.

I rather liked @grail's solution, which in one shot gives you an array with the counts for each of the leading digits as long as there are no indices longer than 2 digits, but I wouldn't classify that one as "trivial" either. "Clever", yes.

Sorry if I upset anyone with my comment. As it popped into my head immediately it did seem trivial to me (sometime forget this is noob section and so learning means not trivial )

Good point on the indices not longer than 2 digits. I did have an alternative, but wasn't sure if it went higher if we then wanted 11 out of 110 or just 1
Assuming only first digit, slight change is: