This file is indexed.

/etc/gprc is in pari-gp 2.9.1-1.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

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\\ 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"

\\ Set maximal stack size. A safe value is half of the system memory.
\\ parisizemax = 1G

\\********************** 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 ?\).