/etc/gprc is in pari-gp 2.7.2-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 | \\ Enable colors.
\\ Should not be set under Emacs, since it use it's own highligth system
\\ For a system-wide config, clear background is preferable
#ifnot EMACS colors = lightbg
\\ dark background:
\\   #ifnot EMACS colors = darkbg
\\ Limit output of commands to first 40 lines to avoid terminal 
\\ choking on thousands lines output.
lines = 40
\\ 
\\ Save GP history between session.
histfile = "~/.gp_history"
\\ Be sloppy with extraneous parens.
\\ strictmatch = 0
\\********************** FORMAT OF THIS FILE :    ***************************
\\  Lines starting with '\\' and between '/*' '*/' pairs are comments
\\  Blank lines are ignored
\\  Line starting with #if KEYWORD is read iff KEYWORD is TRUE
\\  Currently recognized keywords:
\\    EMACS  are we running under Emacs?
\\    READL  is readline available?
\\
\\  This file should be put in $HOME/.gprc or /etc/gprc and contain:
\\  * references to gp scripts that are to be run BEFORE the first gp prompt.
\\
\\    Syntax: read "filename"  (quotes are mandatory. ~ syntax allowed)
\\
\\  * variable definitions (so-called "environment variables" in the sequel)
\\
\\   Definitions are overruled by command line switches. For instance
\\     invoking gp -s 100 will set environment variable stacksize to 100 (not
\\     a very bright thing to do by the way), regardless of what is in .gprc
\\
\\    Syntax: variable name = value
\\
\\  Environment variables which are not set here assume default values in gp.
\\  Can be changed under GP using default(), or keyboard shortcuts (see ?\).
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