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The dot command is not to be confused with a dot file, which is a dot-prefixed hidden file or hidden directory. Nor is it to be confused with the ./scriptfile notation for running commands, which is simply a relative path pointing to the current directory (notated in Unix as a '.' character, and typically outside of the Path variable).
Some commands are internal—built into COMMAND.COM; others are external commands stored on disk. When the user types a line of text at the operating system command prompt, COMMAND.COM will parse the line and attempt to match a command name to a built-in command or to the name of an executable program file or batch file on disk.
WordStar 2000 added few new commands, but completely rewrote the user interface, using simple English-language mnemonics (so the command to remove a word, which had been ^T in WordStar, became ^RW in WordStar 2000; the command to remove the text from the rest of the line to the right of the cursor changed from ^QY to ^RR).
In DOS systems, file directory entries include a Hidden file attribute which is manipulated using the attrib command. Using the command line command dir /ah displays the files with the Hidden attribute. In addition, there is a System file attribute that can be set on a file, which also causes the file to be hidden in directory listings.
The former will only match files with a dot in their name, while the latter will match even those with no dot or extension. Most DOS/Windows commands will match files with no extension even when given a *.* pattern. /S (none) Selects matching files in subdirectories. By default, only the single, specified directory is searched. /C command
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This is a list of the instructions in the instruction set of the Common Intermediate Language bytecode.. Opcode abbreviated from operation code is the portion of a machine language instruction that specifies the operation to be performed.