HI ...
I have to write shell script programing that allow root user to add user or more to the system , I could write the most of script Requirements , but i find it difficult to do this :
the root can add and enter the home directory for each user but my problem is :

Ask the user to provide the following data:
Home directory:
Default is /home/<login>
The script accepts either /home/<string> or /<string>. <string> must
not exceed 10 alphanumeric characters


i find result using regular expression , file globbing ,but i could not find the perfect way and the answer to do that
can you please help me or give me name of good reference ?

If the shell you are using supports the =~ comparison operator then the regex on the right conforms to the description in the regex 7 man page, accessible using Alternatively you could use bash file name expansion pattern matching in a case statement.

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I would use basename (if available) to extract the home dir name, then complete the path in the script

Thanks so much
but my question is how to allow user to add

string consist of alphabet or numeric characters only
and string length not exceed 10 alphanumeric characters.
I use bash script

So you write the script to ask the user to input the home directory and then validate it:

1. Strip any /home from the left
2. Check that what remains matches a regular expression that is / followed by "up to 10" (presumably 1 to 10) alphanumeric characters

LQ does not do homework questions for people. It gives hints about how to answer the question and, when you show what you have tried that didn't work, gives more help.