12/3/2023 0 Comments Cmd.exe dcommandsWhen writing batch scripts it's a good idea to store the values in a named variable SET _LogFile=%~dp1, the rest of the script can then refer to the easy-to-read variable name %_LogFile% This will also make life easier if you later need to change around the order of the parameters. The CMD shell does not read file descriptors, or work with filesystem objects the way that PowerShell does, it is processing a simple list of text strings. If the output of DIR, or a filename with no drive letter/path is expanded to display a Full pathname %~f1 the command shell will assume often incorrectly that the file resides in the current directory. Parameter expansion will treat a Full Stop within a directory name as a file extension, so for a name like " Sample 2.6.4" the output of %~n1 will be truncated to " Sample 2.6" to return the whole folder name use %1 or %~nx1 When used as part of a FOR command in a batch file, two %'s are required:įor %%G in ("%_file%") DO echo Drive=%%~dG Path=%%~pG Name=%%~nG Ext=%%~xG This is unlike regular variables which have both leading and trailing %'s such as %variable%, or FOR command variables which use a single leading % on the command line or a double leading %% when used in a batch file. These parameter/ argument variables are always denoted with a single leading % %~nx2 Expand %2 to a file name and extension only. %~sp1 Expand %1 to a path shortened to 8.3 characters. %~dp1 Expand %1 to a drive letter and path only. %~$PATH:1 Search the PATH environment variable and expand %1 to the fully qualified name of the first match found. %~1 Expand %1 removing any surrounding quotes (") %~s1 Change the meaning of f, n, s and x to reference the Short 8.3 name (if it exists.) %~x1 Expand %1 to a file eXtension only. Or if only a path is present, with no trailing backslash, the last folder %~n1 Expand %1 to a file Name without file extension or path - MyFile \utils\ this includes a trailing \ which will be interpreted as an escape character by some commands. %~d1 Expand %1 to a Drive letter only - C: %~f1 Expand %1 to a Fully qualified path name - C:\utils\MyFile.txt We are using the variable %1 (but this works for any argument, including FOR parameters). When an argument is used to supply a filename then the following extended syntax can be applied: This will keep the parameter numbers (%1 %2 etc) consistent. If there is any chance that an argument may be NULL or a zero length string, then surround it with double quotes. If the argument being passed contains any spaces, then surround it with double quotes. Only arguments %1 to %9 can be referenced by number. %* in a batch script refers to all the arguments (e.g. The first item passed is always %1 the second You can get the value of any argument using a % followed by it's numerical position on the command line. How-to: Pass Command Line arguments (Parameters) to a Windows batch file.Ī command line argument (or parameter) is any value passed into a batch script:Ĭ:> MyScript.cmd January 1234 "Some value"Īrguments can also be passed to a subroutine with CALL:
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