Shell Programming and Scripting

please can you help me with this script ( very very important )

what I'm trying is to write program that accepts list of user as its argument
1- If a user or more are given as arguments, the script should reset files permissions as follows:
a. Directory ~/share to 750 (if it exists).
b. All regular files inside ~/share to 744.
c. All directories inside ~/share to 750.
d. All other regular files in ~ to 600 and all other directories in ~ to 700.
e. files of other types are left as they are.

We assume that there is only one level of files and directories inside ~ (except for ~/share), and there is only one level of files and directories inside ~/share.

2- If no arguments are give, the script should identify normal users in the system (UID >= 500) and for each user, reset files permissions as described above.

3- At the end of the execution, the script must produce a file named report.txt that contains a list of all files in the user's home directory including full path, owner, group and permissions for each file.

please help me if you can

Look very much homework...

What have you done so far?

I am very new to Linux and this is what some friend of mine give me to test what I learn
and i tried very much to solve it but till now I couldn't do anything

All right, what have you tried then?

Start with "man find" especially -type and -path, but not -exec.

Something like this is very durable and fast, one line for each situation:

Code:

find ... -type d | xargs -n 101 chmod 765

Code:

[ -d ~/share ] && find ~/share -type f -print0 | while read -d $'\0' file
do
  # if $file exists and is a regular file
  [ -f "$file" ] && chmod 744 "$file"
done

Easy to match to spec and comment (case is nice that way, but use balanced parentheses so vi % is not disabled):
(Note: files in ~ like .profile, code, scripts no longer executable)

Code:

find ~ |while read p
do
 case "$p" in
 (~/share)
   chmod 750 "$p"
   ;;
 (~/share/*)
   if [ -f "$p" ];then
     chmod 744 "$p"
   else
     if [ -d "$p" ];then
       chmod 750 "$p"
     fi
   fi
   ;;
 (*)
    if [ -f "$p" ];then
     chmod 600 "$p"
   else
     if [ -d "$p" ];then
       chmod 700 "$p"
     fi
   fi
   ;;
 esac
done