Shell Programming and Scripting

All,
I am new to Unix scripting ans was looking for some guidance.

I basically have to:
1. Check if a directory exists - if not create it
2. Check the permissions of the dir - if Wrong change
loop this.

Sort of creating a directory tree.

Thanks.

To make a directory tree, even if some don't exists, use :

Code:

mkdir -p toto/titi/tata/tutu

Use umask command to set default rights on creation.
Use chmod command to set rights after creation.

Good luck.

Ok - Here is what I need:
Below is the directory structure that I want to create and set permissions on.
Directory Permissions
/apps/ki01/logs/app_yyxzzz drwxr-xr-x
/apps/ki01/bin/app_yyxzzz drwxr-xr--
/apps/ki01/scripts/app_yyxzzz drwxr-xr--
/apps/ki01/src/app_yyxzzz drwxr-xr--
/apps/ki01/ssl/app_yyxzzz/ drwxr-x---
/apps/ki01/htdocs/IHS_yyxzzz/ drwxr-xr--
/apps/ki01/ssl/IHS_yyxzzz/ drwxr-x---
/export/home/trace/app_yyxzzz/ drwxr-xr-x

1st - I need to check if the directory already exists and also if it matches the permissions.
2nd - if not then create the directory and set correct permissions.
This is for all directories.