The -version and -help options are interpreted even if xterm cannot open a display, and along with the -class option, are checked before all other options. If an option begins with a " +" instead of a " -", the option is restored to its default value.
Originally written in 1984 for the DEC VAXStation as a stand-alone program, xterm was quickly integrated into X, and today most X terminal emulators are variations of the original xterm code. Several instances of xterm can run at the same time within the same display, each one providing input and output for a shell or another process.
Xterm is the standard terminal emulator of the X Window System, providing a command-line interface within a window.
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