I would like to translate this Linux/Bash script to Windows shell:
if test -d myDirName; then echo "ok"; else mkdir myDirName; fiIt tests if a directory exists, and if it doesn't it creates it.
110 Answers
@echo off
IF exist myDirName ( echo myDirName exists ) ELSE ( mkdir myDirName && echo myDirName created)Added by Barlop
While the above works for this particular situation, the title says about testing specifically for a directory. Phogg's comment using if exist mydirname\ rather than if exist mydirname is the way. Some answers have used \nul but \nul is problematic in NT. Not including a trailing backslash will test for a file or a directory. So, for a directory, include the trailing backslash.
Here is what I just found out:
You can test if a nul file exists; if the directory exists it will contain a nul file, if the nul file does not exist then the directory does not exist.
IF exist myDirName/nul ( echo myDirName exists ) ELSE ( mkdir myDirName && echo myDirName created)Use a backslash, not forward slash: myDirName\nul not myDirName/nul
md foo
echo.>bar
for %I in (foo bar xyz) do @( if exist %I ( if exist %I\nul ( echo -- %I is a directory ) else ( echo -- %I is a file ) ) else ( echo -- %I does not exist )
)-- foo is a directory
-- bar is a file
-- xyz does not exist
edit: this only works if directory name does not contain spaces
Some have suggested doing \nul, but that doesn't seem to work reliably in NT
C:\blah>md abc
C:\blah>if exist abc\nul echo yes
yes
C:\blah>if exist "abc\nul" echo yes
C:\blah>foxidrive writes-
The trick with nul worked in pre NT versions of windows.
Now you would use this, with a trailing backslash.
if exist "C:\abcde\" echo the folder existsRe the question
C:\blah>if exist "abcd\" (echo yes) else (echo no && mkdir abcd)
no
C:\blah>if exist "abcd\" (echo yes) else (echo no && mkdir abcd)
yes
C:\blah>I wondered why joe had a downvote as I was experiencing the same kind of problem on Windows 7, namely that
IF EXIST filename\NUL
was returning TRUE for both files and directories. I found an alternative solution at and came up with a revised version of DVF's FOR loop:
FOR %I in (foo bar xyz) DO @( PUSHD %I && (POPD & echo -- %I is a directory) || ( IF exist %I ( echo -- %I is a file ) ELSE ( echo -- %I does not exist ) ) )I see many have problems with differentiating between files and folders. Has anyone tried to simply cd into it after checking it exists? Then cd will either succeed or fail.
set MyDir = "MyTestDir"
IF exist MyDir ( cd MyDir IF ERRORLEVEL NEQ 0 ( echo "Error: %MyDir% already exists, but it is a file!" exit 1 ) else ( # Do not forget to cd back cd .. )
) else ( # Did not exist yet, so create it. mkdir MyDir
)Here's a way to test the directory exists only when its a valid directory.
set myDirName=foobitybarbitybaz
dir /A:D %myDirName% >nul 2>&1
if ERRORLEVEL 1 (@mkdir %myDirName%) else (@echo "ok")exist myDirName/nulalso is true if myDirName is a file, whis is not the searched functionality
1I prefer using dir /d | findstr \[\.\.\]:
2>nul dir /d "myDirName" | findstr \[\.\.\] >nul && echo= "ok" || mkDir myDirName&&echo= Is NOT dir
2>nul dir /d "myDirName" | findstr \[\.\.\] >nul && echo= "ok" || mkDir myDirNameFor create if exist or not and for ignore error...
2>nul mkDir myDirNameAlso ...
if exist "myDirName\." (echo/"ok") else mkdir myDirName
rem :: or direct create myDirName hidden/ignoring error 2>nul mkdir myDirName & if exist "myDirName\." echo/ exist
rem :: output: exist Finding a folder shouldn't be this difficult. My solution, use perl:
for($cnt=$#ARGV; $cnt>=0; --$cnt)
{ if ( -d "$ARGV[$cnt]" ) { print "argv[$cnt]=$ARGV[$cnt] is a folder\n"; $dir = $ARGV[$cnt]; break; } else { print "argv[$cnt]=$ARGV[$cnt] is Not a folder\n"; }
} 1 
