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Top Forums UNIX for Dummies Questions & Answers Help in UNIX Post 302767739 by alister on Thursday 7th of February 2013 11:19:33 AM
Old 02-07-2013
Quote:
Originally Posted by Srivathsava
But if I am in a/b directory and searching for that file with that command and if any sub folders of b,c or d doesn't have read permissions, its stopped searching there.
That's the entire point of the security model. If you do not have read permission you are not allowed to read. You either need to run find as a different user, one that has read permission, or the file hierarchy's ownership and/or permissions need to be modified.

If I recall correctly, for a find traversal you'll need read permissions for every directory that is visited, and execute (search) permissions for every path component, even if it's upstream and not visited. So if you start your search at directory "d" with hopes of reaching "f", whose path is /a/b/c/d/e/f/, you will need execute permission on every directory from the root to "f", but you'll only need read permissions for "d", "e", and "f".

With cd, you can "jump" to a directory, but only if you know its location and have execute permission on every directory above it. If you lack that permission on even just one of its ancestors, you won't be able to make it the current working directory. Once in that directory, you'll still need read permission to list its contents and write permission to create/delete files.

Regards,
Alister

Last edited by alister; 02-07-2013 at 12:41 PM..
 

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LS(1)							      General Commands Manual							     LS(1)

NAME
ls, lc - list contents of directory SYNOPSIS
ls [ -dlmnpqrstuFQ ] name ... lc [ -dlmnpqrstuFQ ] name ... DESCRIPTION
For each directory argument, ls lists the contents of the directory; for each file argument, ls repeats its name and any other information requested. When no argument is given, the current directory is listed. By default, the output is sorted alphabetically by name. Lc is the same as ls, but sets the -p option and pipes the output through mc(1). There are a number of options: -d If argument is a directory, list it, not its contents. -l List in long format, giving mode (see below), file system type (e.g., for devices, the # code letter that names it; see intro(3)), the instance or subdevice number, owner, group, size in bytes, and time of last modification for each file. -m List the name of the user who most recently modified the file. -n Don't sort the listing. -p Print only the final path element of each file name. -q List the qid (see stat(3)) of each file; the printed fields are in the order path, version, and type. -r Reverse the order of sort. -s Give size in Kbytes for each entry. -t Sort by time modified (latest first) instead of by name. -u Under -t sort by time of last access; under -l print time of last access. -F Add the character / after all directory names and the character * after all executable files. -L Print the character t before each file if it has the temporary flag set, and - otherwise. -Q By default, printed file names are quoted if they contain characters special to rc(1). The -Q flag disables this behavior. The mode printed under the -l option contains 11 characters, interpreted as follows: the first character is d if the entry is a directory; a if the entry is an append-only file; D if the entry is a Unix device; L if the entry is a symbolic link; P if the entry is a named pipe; S if the entry is a socket; - if the entry is a plain file. The next letter is l if the file is exclusive access (one writer or reader at a time). The last 9 characters are interpreted as three sets of three bits each. The first set refers to owner permissions; the next to permissions to others in the same user-group; and the last to all others. Within each set the three characters indicate permission respectively to read, to write, or to execute the file as a program. For a directory, `execute' permission is interpreted to mean permission to search the directory for a specified file. The permissions are indicated as follows: r if the file is readable; w if the file is writable; x if the file is executable; - if none of the above permissions is granted. SOURCE
/src/cmd/ls.c /bin/lc SEE ALSO
stat(3), mc(1) LS(1)
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