Sunday, January 23, 2011

What's a simple way to list the immediate subdirectories of a given location?

Is there a built-in command or a less verbose way of achieving this?

find /var/foo -maxdepth 1 -mindepth 1 -type d

Or should I just make a tiny shell script or function if I'm doing this sort of thing often?

  • ls -d */
    

    "-d" means don't delve into the directories, the "*/" only matches directories.

    Warner : +1 for globbing.
    Bribles : What about directories that start with a "." ? I have edited my question since the title asks for subdirectories, and specifying only maxdepth also returns ./ which is not desired
    mibus : "ls -d .[A-z0-9]*" will catch most (but not necessarily all).
    Bribles : Well, you'd need to do ls -d */ .[A-z0-9]*/ to get both regular and a subset of hidden files.
    From mibus
  • If one cares not about files beginning with a dot then mibus' answer of

    ls -d /var/foo/*/
    

    would be short and effective. However if one would like the hidden files to be included then one needs to either stick with

    find /var/foo -maxdepth 1 -mindepth 1 -type d
    

    or try

    ls -FA /var/foo | grep /
    

    The -F places / and the end of directory names (as well as other characters for other types of files). The -A causes files starting with a dot to be included, except for '.' and '..'. That is why -a is not used. The grep won't get any false positives since '/' is not allowed in filenames (at least for POSIX filesystems).

    Regarding performance, on my Ubuntu Jaunty installation with just shy of 32k files and directories in /var/foo, find is the fastest, followed by ls -d, and ls -FA with grep comes in last.

    From Bribles

0 comments:

Post a Comment