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On my user folder, I have folders like D ropbox, D ocuments, D ownloads & d ump.

ls a* should list all the files whose name starts with a. Right? But when I gives the command ls d*, instead of just displaying dump it shows me the ls of dump directory. And When I gives the command as ls D*, then it displays ls of all foldes starting with D

So what part did I miss in understand it?

Edit: Attaching a screenshot ls screenshot

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2 Answers 2

up vote 10 down vote accepted

According to bash man page:

bash scans each word for the characters *, ?, and [. If one of these characters appears, then the word is regarded as a pattern, and replaced with an alphabetically sorted list of file names matching the pattern

and from info node for ls

The `ls' program lists information about files (of any type, including directories). Options and file arguments can be intermixed arbitrarily, as usual.

For non-option command-line arguments that are directories, by default 'ls' lists the contents of directories, not recursively, and omitting files with names beginning with '.'. For other non-option arguments, by default `ls' lists just the file name. If no non-option arguments are specified, 'ls' lists the contents of the current directory.

so when yo give ls d*, d* is expanded to sorted list of all file/directory names starting with d. So you command becomes

ls dump

and as dump is a directory name so you get the listing of all files in the directory "dump' but when you give ls D*, D* is expanded to "Desktop Documents Downloads Dropbox", so the command becomes

ls Desktop Documents Downloads Dropbox

and as all of these are directories, you get the listing of files in individual directory. If there was a file starting with D in current directory it would have been listed seperately.

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2  
A minor addition: When more than one directory is given as an argument, ls displays the name of each directory before listing its content. It will not do it for a single directory. –  Marcel Stimberg Feb 10 '11 at 16:17
    
Thanks! That cleared my doubt. I did a ls p* and it showed up a file because it exists and a ls P* shows the Pictures Public folder as there is no file starting with P. And when I created a directory named poo, it showed up on ls p* –  Ashfame Feb 10 '11 at 16:29
    
Marchel, yes got that too. Thanks :) –  Ashfame Feb 10 '11 at 16:29

ls d* and D* both list files and folders matching d* and D* respectively, the behaviour is the same, there must have been a mistake on your test.

If you want to list only the folder names and not the folder contents you need to use "-d":

ls -d D*
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I have attached a screenshot, please take a look –  Ashfame Feb 10 '11 at 16:00

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