If you are getting that error, it means that either Java is not installed, or is not in your path.
If Java is not installed, go to http://www.java.com to install the most recent version of the JRE.
If you're sure you have already installed Java ensure the Java executable is in your system's path. You can do this by first finding the directory it is installed in. For example, mine is installed in C:\Program Files\Java\jre6. The executables are located in the bin directory.
In order to set your path (Assuming Windows Vista), go to Start -> Control Panel -> System, then click on the 'Advanced System Settings' link on the left, then the 'Environment Variables' button. In the lower section (Labeled 'System Variables'), scroll through and find the item labeled 'Path' and double click it. In the field labeled 'Variable value' go to the end and add a semicolon (;), and then the path your installation of Java is located. Using the example I gave above, I would have added ;C:\Program Files\Java\jre6\bin to the end of the line.
The procedure for 64-bit Windows Vista or Windows 7 is the same, except the text you will add to the Path variable is ";C:\Program Files (x86)\Java\jre6\bin". Notice there is still a semi-colon at the beginning of the line.
Once you have done this, you will need to close and reopen the command prompt if it is already open, and you should be able to run java without getting this error message.
The 'ls' command is an external command (found in /bin)
1. Remove java then reinstall 2. check your up to date 3. make sure you using the correct command 4. make sure your an administrator (or run it as a) 5. try again :)
The DOS message "bad command or file name" means that the command you entered was not recognized as an internal command or as an external command in the working directory or path.
It depends on the shell program you are running in your environment; there are a number of 'internal' commands that are recognized by the shell and do not exist as "commands" on the system anywhere. Any command that is not internal to the shell would be considered an external command. To find a list of basic external commands, try to do a 'ls /bin', which lists very essential and common external Unix commands. Look at the 'man' or 'info' entry for your shell to find a list of internal commands. An internal command would be one that is recognized by the shell and the shell does not have to execute a program to do the command. An example would be the 'alias' command, which creates, removes, or lists aliases in the environment. An external command would be one that you might find in the /bin directory, such as 'ls'.
Internal commands are functions that are built into the command interpreter, External commands are those not included in the interpreter, and are instead invoked by calling an external binary. Whether or not a particular command is internal or external varies by system. For example, echo is an internal command in MS-DOS (it is built into COMMAND.COM), while in most Linux systems, it is an external one, provided by GNU coreutils.DOS Internal command is associated with his Shell file Command.Com.. DOS external command is saved on the disk..
An internal command is one that is built into the shell or command interpreter, rather than executed as a separate binary.
In MS-DOS there are two types of commands. An Internal command, which is a command embedded into the command.com file, and an external command, which is not embedded into command.com and therefore requires a separate file to be used. For example, if your computer does not have fdisk.exe and you try using the fdisk command, you would receive an error "Bad command or file name." Fdisk is an external command that will only work if fdisk.exe, or in some cases, fdisk.com, is present. However, as long as MS-DOS is running on your computer internal commands such as the CD command will always be available and does not require any other files to run. Computer Hope's MS-DOS page lists what commands are external and what are internal on each of the command pages. In addition, you can see our dictionary internal command page and/or external command page for a complete listing of each of the internal and external commands available.
1. Internal Command: Present in Command.com..2. External Command: Present in the disk..
There is no easy way - if there is a path name involved then it is external. You could use the 'whence' or 'whatis' commands to see if they are an alias or internal command, but that varies depending on which login shell you are using.
Open command window "cmd" from Windows prompt. Type in "javac" in the window. The command should execute giving full usage of javac and its options. If you get an error message saying that "Javac is not a recognized as an internal or external command", than the Path has not been set.
In MS-DOS there are two ways commands are executed. An Internal command, which is a command embedded into the command.com file, and an external command, which is not embedded into command.com and therefore requires a separate file to be used. For example, if your computer does not have the fdisk.exe file and you try using the fdisk command, you would receive an error "Bad command or file name" error message. Fdisk is an external command that will only work if fdisk.exe, or in some cases, fdisk.com, is present.
A list of internal/builtin commands is available for each shell environment by looking at the 'man' entry. Anything not listed there is either an alias or an external command.
yes it is an external command.
Internal commands are commands that are already loaded in the system, It can be executed at any time and are independent. external commands are loaded when the user requests them. Internal commands don't require a separate process to execute them.
An internal command is one that is built in to the shell interpreter and is likely to be used quite a bit. An external command is a file in a directory that can be searched, loaded, and executed. The reason for having internal commands is for performance; it takes a lot less time to have the shell just execute the given internal command than it would take to find it on the system, load it into memory, and then execute it.
the deleted file if ms dos can be recovered if you use the command mention below immediately,the command is : need External Dos commands and internal dos commands with their meaning
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Then something is wrong with your PC
In DOS systems, an internal command is any command that resides in the COMMAND.COM file. This includes the most common DOS commands, such as COPY and DIR. Commands that reside in other COM files, or in EXE or BAT files, are called external commands
Internal and external commands. Internal commands are built into the command processor. Internal commands include, but are not limited to the following: * dir * mkdir * rmdir * cd * cls * del * copy External commands are not build into the command processor, and depend on the executable being in the path. These are typically .COM or .EXE files. Here are a few examples of these external commands: * format * chkdsk * fdisk * deltree
A command that is stored in the system memory and loaded from the command.com
No, they don't disappear, unless you use the command move to...
You really can't. There is nothing in a prompt that would give that information.
INTERNAL COMMANDSThese are those commands which are contained in command.com files of MS-DOS.These are those functions that are built into the command interpreter.There is no need of any external file in computer to read internal MS-DOS command.These commands can be used as long as DOS is running on the system.Internal commands do not vary from system to system.These are ver, time, del, md, cd, copy con, cls, date, vol, ren, copy etc.EXTERNAL COMMANDSThese are those commands which are not in-built in MS-DOS.External commands are those which are not included in the interpreter.There is a need of an internal file in the computer to read external MS-DOS command.External command may vary from system to system. This means any two computers with same version of MS-DOS may have same internal commands, but may have different external commands.These are tree, xcopy, diskcopy, more, print etc.To execute the command the name of command has to be typed at the promt along with its argument such command is external command.