This file is indexed.

/usr/share/systemtap/tapset/system.stp is in systemtap-common 2.6-0.2.

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

The actual contents of the file can be viewed below.

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/** 
 * sfunction system - Issue a command to the system
 *
 * @cmd: the command to issue to the system
 *
 * Description: This function runs a command on the system.  The
 * command is started in the background some time after the current
 * probe completes. The command is run with the same UID as the user
 * running the stap or staprun command.
 */
function system (cmd:string) %{ /* unprivileged */
	_stp_ctl_send(STP_SYSTEM, STAP_ARG_cmd, strlen(STAP_ARG_cmd)+1);
%}