notcurses-info(1) notcurses-info(1)

notcurses-info - Display information about the terminal environment

notcurses-info [-v]

notcurses-info prints all the information it knows about the current terminal environment, including material loaded from terminfo(5) (based on the TERM environment variable), replies from the terminal in response to our queries, and built-in heuristics.

The Unicode half block, quadrant, sextant, and Braille glyphs are all included in the output. If their appearance is irregular, it might behoove you to choose another font.

The first five lines (the Notcurses initialization banner; see notcurses_init(3)) provide:

The Notcurses version and the derived terminal name, possibly including the terminal version. If Notcurses was able to unambiguously query the connected terminal, the internal name for the terminal will be shown. Otherwise, the terminal described by the TERM environment variable will be displayed. The terminal version is only acquired via query.
The current cell geometry, cell-pixel geometry, and the derived window pixel geometry, the size of the crender structure, the number of colors in the palette, and whether RGB TrueColor is supported.
The compiler name and version used to build Notcurses, the size of the nccell structure, and the endianness with which Notcurses was compiled. This buildtime endianness must match the runtime endianness.
The version of libterminfo against which Notcurses was compiled.
The version and name of the multimedia backend.

The next five lines describe properties of the terminal environment:

The first line indicates that a given capability is present with a plus sign ('+'), or not present/detected with a minus sign ('-'):
af: Foreground color can be set
ab: Background color can be set
sum: Synchronized Update Mode is supported
vpa: Cursor can be moved to an absolute vertical coordinate
hpa: Cursor can be moved to an absolute horizontal coordinate
sgr0: Styling can be reset via a single escape
op: Colors can be reset via a single escape
fgop: Foreground can be reset via a single escape
bgop: Background can be reset via a single escape
bce: The back-color-erase property is in play
rect: Rectangular editing is available
The second line is more of the same:
bold: Boldface is available
ital: Italics are available
struck: Strikethrough is available
ucurl: Curled underlines are available
uline: Straight underlines are available
u7: Cursor position reporting
ccc: Palette can be reprogrammed
rgb: Colors can be specified as RGB wit eight bits/channel
el: Clearing can be performed through the end of the line
The third line also covers UTF8 and decoding capabilities:
utf8: This is a UTF8 environment
2x1: Upper- and lower-half blocks are available
2x2: Quadrant blocks are available
3x2: Sextant blocks are available
4x2: Braille characters are available
img: Images can be decoded
vid: Video can be decoded
indn: Multiple-line scrolling is available
gpm: Connection is established to the GPM server
kbd: The Kitty keyboard protocol is in use
The fourth line indicates the default background color, and whether that color is treated as transparent by the terminal (only kitty is known to do this), and the default foreground color. pmouse indicates whether pixel-precise mouse events are supported.
The fifth line describes the available bitmap graphics. If Sixels are available, the maximum number of color registers and maximum Sixel geometry are reported. If Linux framebuffer graphics are available, that is reported. If the Kitty graphics protocol is detected, that will be reported with "rgba graphics are available"; if Kitty's animation support is also present, that will be reported with "rgba pixel animation support".

To the right of this material is the Notcurses homepage's URI, and the Notcurses logo (the latter only if bitmap graphics are available).

The final eleven lines, only printed when in a UTF8 locale, show various Unicode glyphs. The first four lines include the quadrant, sextant, and box-drawing characters. The next four lines include the entire Braille set. The following two lines include many of the Symbols for Legacy Computing introduced in Unicode 13. The final line includes many emoji.

-v: Be verbose.

The behavior of notcurses-info (and indeed all of Notcurses) depends on the TERM and LANG environment variables, the installed POSIX locales, and the installed terminfo(5) databases.

tack(1), notcurses(3), terminfo(5)

nick black <>.