This file is indexed.

/usr/share/sagemath/bin/sage-env is in sagemath-common 8.1-7ubuntu1.

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

The actual contents of the file can be viewed below.

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#!/bin/bash

if [[ -z ${SAGE_ROOT} ]]; then
	export SAGE_ROOT="/usr/share/sagemath"
fi

if [[ -z ${SAGE_LOCAL} ]]; then
	export SAGE_LOCAL="/usr"
fi

if [[ -z ${SAGE_DATA} ]]; then
	export SAGE_DATA="/usr/share/sagemath"
fi

if [[ -z ${SAGE_SHARE} ]]; then
	export SAGE_SHARE="/usr/share/sagemath"
fi

if [[ -z ${SAGE_DOC} ]]; then
	export SAGE_DOC="/usr/share/doc/sagemath"
fi

if [[ -z ${SAGE_DOC_SRC} ]]; then
 if [[ -n ${SAGE_SRC} ]]; then
	 export SAGE_DOC_SRC="$SAGE_SRC/doc"
 fi
fi

if [[ -z ${SAGE_EXTCODE} ]]; then
	export SAGE_EXTCODE="/usr/share/sagemath/ext"
fi

if [[ -z ${SAGE_SPKG_INST} ]]; then
 export SAGE_SPKG_INST="/usr/share/sagemath/installed"
fi

if [[ -z ${SAGE_SCRIPTS_DIR} ]]; then
 export SAGE_SCRIPTS_DIR="/usr/share/sagemath/bin"
fi

if [[ -z ${DOT_SAGE} ]]; then
	export DOT_SAGE="${HOME}/.sage"
fi

if [ "$SAGE_STARTUP_FILE" = "" ]; then
	export SAGE_STARTUP_FILE="${DOT_SAGE}/init.sage"
fi

if [[ -z ${SAGE_TESTDIR} ]]; then
	export SAGE_TESTDIR="${DOT_SAGE}/tmp"
fi
if [[ -z ${SAGE_SERVER} ]]; then
	export SAGE_SERVER="http://www.sagemath.org/"
fi

if [ -z "$SAGE_RC_FILE" ]; then
	SAGE_RC_FILE="$DOT_SAGE/sagerc"
fi

if [ -r "$SAGE_RC_FILE" ]; then
	source "$SAGE_RC_FILE"
	if [ $? -ne 0 ]; then
		echo >&2 "Error sourcing $SAGE_RC_FILE"
		exit 1
	fi
fi

export EPYTHON=python2.7
export MPMATH_NOGMPY=1
export PATH="$PATH:$SAGE_SCRIPTS_DIR"
GP_DATA_DIR="/usr/share/pari" && export GP_DATA_DIR
GPHELP="/usr/bin/gphelp" && export GPHELP
GPDOCDIR="/usr/share/pari/doc" && export GPDOCDIR
SINGULARPATH="/usr/share/singular" && export SINGULARPATH
SINGULAR_EXECUTABLE="/usr/bin/Singular" && export SINGULAR_EXECUTABLE

# Handle parallel building/testing/...
# See Trac Ticket #12016
# First, figure out the right values for SAGE_NUM_THREADS (default
# number of threads) and SAGE_NUM_THREADS_PARALLEL (default number of
# threads when parallel execution is asked explicitly).
sage_num_threads_array=(`sage-num-threads.py 2>/dev/null || echo 1 2 1`)
SAGE_NUM_THREADS=${sage_num_threads_array[0]}
SAGE_NUM_THREADS_PARALLEL=${sage_num_threads_array[1]}
export SAGE_NUM_THREADS
export SAGE_NUM_THREADS_PARALLEL

# Display the Sage startup banner, used in src/bin/sage
sage_banner() {
    if [ "$SAGE_BANNER" != "no" ]; then
        cat "$SAGE_SCRIPTS_DIR/sage-banner" 2>/dev/null
    fi
}