windows上的unix“which java”等效命令[[副本]

您可以尝试:

c:\> for %i in (java.exe) do @echo.   %~$PATH:i
   C:\WINDOWS\system32\java.exe

这是Windows的一项功能 for 命令,您可以使用 for /? 要获取详细信息:

In addition, substitution of FOR variable references has been enhanced.
You can now use the following optional syntax:
    %~I         - expands %I removing any surrounding quotes (")
    %~fI        - expands %I to a fully qualified path name
    %~dI        - expands %I to a drive letter only
    %~pI        - expands %I to a path only
    %~nI        - expands %I to a file name only
    %~xI        - expands %I to a file extension only
    %~sI        - expanded path contains short names only
    %~aI        - expands %I to file attributes of file
    %~tI        - expands %I to date/time of file
    %~zI        - expands %I to size of file
    %~$PATH:I   - searches the directories listed in the PATH
                   environment variable and expands %I to the
                   fully qualified name of the first one found.
                   If the environment variable name is not
                   defined or the file is not found by the
                   search, then this modifier expands to the
                   empty string

The modifiers can be combined to get compound results:
    %~dpI       - expands %I to a drive letter and path only
    %~nxI       - expands %I to a file name and extension only
    %~fsI       - expands %I to a full path name with short names only
    %~dp$PATH:I - searches the directories listed in the PATH
                   environment variable for %I and expands to the
                   drive letter and path of the first one found.
    %~ftzaI     - expands %I to a DIR like output line

In the above examples %I and PATH can be replaced by other valid
values.  The %~ syntax is terminated by a valid FOR variable name.
Picking upper case variable names like %I makes it more readable and
avoids confusion with the modifiers, which are not case sensitive.

这是我平时用的。如果我今天再做一次,我可能会做得有点不同,但效果很好,我已经有好几年没有任何理由去看它了(事实上,我很确定上次我看了它)

// Which.c:
#include <io.h>
#include <stdio.h>
#include <string.h>
#include <stdlib.h>

char *extensions[] = { "com", "exe", "bat", "cmd", NULL };

int is_exe(char *ext) {

    int i;

    for ( i = 0; extensions[i]; i++)
        if ( 0 == stricmp(ext, extensions[i] ) )
            return 1;
    return 0;
}

int main(int argc, char **argv) {

    char path[FILENAME_MAX];
    char buffer[FILENAME_MAX];
    char *path_var;
    char *ext;
    char *dir;
    int i;

    if (argc != 2) { 
        fprintf(stderr, "Usage: which <filename>\n");
        return 1;
    }

/* First try to find file name as-is.
 */
    if ( 0 == access(argv[1], 0)) {
        printf("\n%s", argv[1]);
        return 0;
    }

/* Okay, it wasn't found.  See if it had an extension, and if not, try
 * adding the usual ones...
 */

    ext = strrchr(argv[1], '.' );

    if ( 0 == ext++ || !is_exe(ext) ) {
        for ( i = 0; extensions[i]; i++) {

            sprintf(buffer, "%s.%s", argv[1], extensions[i]);

            if ( 0 == access(buffer, 0)) {
                printf("\n%s", buffer);
                return 0;
            }
        }

        if ( NULL == (path_var=getenv("PATH")))
            return 1;

        dir = strtok(path_var, ";");
        do {
            for ( i = 0; extensions[i]; i++) {

                sprintf(buffer, "%s\\%s.%s", dir, argv[1], extensions[i]);

                if ( 0 == access( buffer, 0)) {
                    printf("\n%s", buffer);
                    return 0;
                }
            }
        } while ( NULL != ( dir = strtok(NULL, ";")));
    }

    else {
        if ( NULL == (path_var=getenv("PATH")))
            return 1;

        dir = strtok(path_var, ";");
        do {
            sprintf(buffer, "%s\\%s", dir, argv[1]);

            if ( 0 == access( buffer, 0)) {
                printf("\n%s", buffer);
                return 0;
            }
        } while ( NULL != ( dir = strtok(NULL, ";")));
    }
    return 1;
}

我是不是漏了什么?试试下面的简单命令行怎么样?

c:>目录java.exe

或

c:>目录javaw.exe

他们需要时间,但他们会工作。如果你想让它更快,从“c:\ProgramFiles”开始