In computing, dpath
is an internal cmd.exe command on IBM OS/2[1] and Microsoft Windows[2][3] that allows using a set of files with the TYPE
command and with input redirection as if they are in the current directory. On Windows it is undocumented and deprecated. dpath
differs from the append
command in the way it operates. dpath
informs programs what directories they should search in order to find computer files. It is then up to the applications to recognize %DPATH%
. Using the append
command on the other side, programs are able to find files without recognizing that the command is in effect.
Developer(s) | IBM, Microsoft |
---|---|
Initial release | December 1987 |
Operating system | OS/2, Windows |
Type | Command |
History
editIn DOS the append
command allows programs to open data files in specified directories as if they were in the current directory. Since Windows NT this is not working as the cmd.exe introduced command processor extensions and append
become redundant. Despite this the executable was and is still available in 32-bit versions of Windows. Anyway, the command relied on %DPATH%
environment variable, which can be edited with the dpath
command. In the modern Windows installations only the dpath
command is working despite the help message still is pointing to the append
command.[4][5]
Syntax
editDPATH pathname [;pathname] [;pathname] [;pathname]... DPATH DPATH ; pathname : drive letter and/or folder ; : the command 'DPATH ;' will clear the path
Without parameters the will display the current list of the directories.
Editing %DPATH%
environment variable also can be used.
DPATH /? will print the append
command help message.
Usage
editInput redirection:[4]
C:\>echo hello>c:\test\in.txt
C:\batch>type c:\test\in.txt
hello
C:\>dir /a /b
C:\>set /p var=<in.txt
The system cannot find the file specified.
C:\>set var
Environment variable var not defined
C:\>dpath c:\test;
C:\>set /p var=<in.txt
C:\>set var
var=hello
With TYPE command:[5]
C:\>echo hello>c:\test\in.txt
C:\batch>type c:\test\in.txt
hello
C:\>dir /a /b
C:\>set /p var=<in.txt
The system cannot find the file specified.
C:\>type in.txt
hello
See also
editReferences
edit- ^ "JRT Help - OS/2 Commands".[permanent dead link]
- ^ Hill, Tim (1998). Windows NT Shell Scripting. Macmillan Technical Publishing. ISBN 978-1578700479.
- ^ https://ss64.com/nt/path.html#dpath
- ^ a b "[Undocumented] Input redirection check DPATH (Page 1) / Windows CMD Shell / SS64 Forum".
- ^ a b "[Undocumented] New info for Type command, Dpath is not deprecated (Page 1) / Meta / SS64 Forum".
Further reading
edit- Peter Dyson (1995). Mastering OS/2 Warp. Sybex. ISBN 978-0782116632.
- Kathy Ivens; Brian Proffit (1993). OS/2 Inside & Out. Osborne McGraw-Hill. ISBN 978-0078818714.
- Barry Nance; Greg Chicares (1992). Using OS/2 2.0. Que Publishing. ISBN 978-0880228633.