{
  "id": "terminal-osc/1",
  "family": "terminal-osc",
  "slug": "1",
  "title": "OSC 1 — Set icon name",
  "summary": "OSC 1 ; text ST sets the terminal's icon name (the short label used for the minimized/taskbar/tab representation), as distinct from the full window title. OSC 2 sets the title only; OSC 0 sets both icon name and title at once.",
  "kind": "control-sequence",
  "aliases": [
    "set icon name",
    "OSC 1",
    "ESC ] 1",
    "icon title"
  ],
  "status": "de-facto",
  "verification": "verified",
  "tier": "B",
  "source_url": "https://invisible-island.net/xterm/ctlseqs/ctlseqs.html",
  "source_version": "xterm ctlseqs, patch #410, 2026/04/19",
  "retrieved_date": "2026-05-29",
  "attribution": [
    {
      "claim_ref": "#summary",
      "source_url": "https://invisible-island.net/xterm/ctlseqs/ctlseqs.html",
      "source_version": "xterm patch #410, 2026/04/19",
      "note": "xterm ctlseqs: Ps = 1 -> Change Icon Name to Pt. (Ps = 0 changes Icon Name AND Window Title; Ps = 2 changes Window Title only.)"
    }
  ],
  "see_also": [
    "terminal-osc/0",
    "terminal-osc/2"
  ],
  "ext_type": "terminal-escape@1",
  "ext": {
    "csi_or_osc": "OSC",
    "command_number": 1,
    "frame": {
      "introducer_7bit": "\u001b]",
      "introducer_7bit_readable": "ESC ] (0x1B 0x5D)",
      "introducer_8bit": "",
      "introducer_8bit_readable": "0x9D (single-byte OSC, 8-bit C1)",
      "note": "OSC frame per ECMA-48 5th ed. 1991 / ISO 6429. Command number 1 is an xterm/vendor convention with no formal registry."
    },
    "terminator": "ST|BEL",
    "terminator_detail": {
      "canonical_ST_7bit": "\u001b\\",
      "canonical_ST_7bit_readable": "ESC \\ (0x1B 0x5C)",
      "canonical_ST_8bit": "œ",
      "canonical_ST_8bit_readable": "0x9C (single-byte ST, 8-bit C1)",
      "alt_BEL": "\u0007",
      "alt_BEL_readable": "BEL (0x07)",
      "note": "ECMA-48 mandates ST; xterm and most modern terminals also accept BEL. Emit ST, accept both."
    },
    "params": [
      {
        "id": "set",
        "anchor": "#set",
        "name": "Set icon name",
        "meaning": "OSC 1 ; Pt ST sets the icon name to the string Pt. Used for the minimized/taskbar/tab label, separate from the window title (OSC 2).",
        "required": true,
        "byte_sequence_ST": "\u001b]1;myapp\u001b\\",
        "byte_sequence_ST_readable": "ESC ] 1 ; m y a p p ESC \\   ==  \\x1b]1;myapp\\x1b\\\\   (set icon name)",
        "byte_sequence_BEL": "\u001b]1;myapp\u0007",
        "byte_sequence_BEL_readable": "ESC ] 1 ; m y a p p BEL   ==  \\x1b]1;myapp\\x07",
        "subparams": []
      }
    ],
    "gotchas": [
      "OSC 1 sets the ICON NAME only; OSC 2 sets the WINDOW TITLE only; OSC 0 sets BOTH. Pick the right number for what you want to change.",
      "Many modern terminals/tabs show only one string and treat icon name and title interchangeably, so OSC 1 may appear to do nothing visible.",
      "The string is plain text terminated by ST (or BEL); embedded control bytes are not allowed.",
      "There is no standard QUERY form for OSC 1 (unlike color OSCs); some terminals support OSC 21 to query the title-related strings.",
      "Restore or clear the title/icon on exit if you changed it, so the user's terminal label isn't left altered."
    ],
    "v1_smoke_test": {
      "asserts": "OSC 1 set-icon-name renders as a byte-exact OSC string in both ST and BEL terminator forms.",
      "behavioral_conformance": "deferred to v2."
    }
  },
  "updated": "2026-05-29T00:00:00Z"
}