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Demonstrations of opensnoop, the Linux bpftrace/eBPF version. opensnoop traces the open() syscall system-wide, and prints various details. Example output: # ./opensnoop.bt Attaching 3 probes... Tracing open syscalls... Hit Ctrl-C to end. PID COMM FD ERR PATH 2440 snmp-pass 4 0 /proc/cpuinfo 2440 snmp-pass 4 0 /proc/stat 25706 ls 3 0 /etc/ld.so.cache 25706 ls 3 0 /lib/x86_64-linux-gnu/libselinux.so.1 25706 ls 3 0 /lib/x86_64-linux-gnu/libc.so.6 25706 ls 3 0 /lib/x86_64-linux-gnu/libpcre.so.3 25706 ls 3 0 /lib/x86_64-linux-gnu/libdl.so.2 25706 ls 3 0 /lib/x86_64-linux-gnu/libpthread.so.0 25706 ls 3 0 /proc/filesystems 25706 ls 3 0 /usr/lib/locale/locale-archive 25706 ls 3 0 . 1744 snmpd 8 0 /proc/net/dev 1744 snmpd 21 0 /proc/net/if_inet6 1744 snmpd 21 0 /sys/class/net/eth0/device/vendor 1744 snmpd 21 0 /sys/class/net/eth0/device/device 1744 snmpd 21 0 /proc/sys/net/ipv4/neigh/eth0/retrans_time_ms 1744 snmpd 21 0 /proc/sys/net/ipv6/neigh/eth0/retrans_time_ms 1744 snmpd 21 0 /proc/sys/net/ipv6/conf/eth0/forwarding 1744 snmpd 21 0 /proc/sys/net/ipv6/neigh/eth0/base_reachable_time_ms 1744 snmpd -1 2 /sys/class/net/lo/device/vendor 1744 snmpd 21 0 /proc/sys/net/ipv4/neigh/lo/retrans_time_ms 1744 snmpd 21 0 /proc/sys/net/ipv6/neigh/lo/retrans_time_ms 1744 snmpd 21 0 /proc/sys/net/ipv6/conf/lo/forwarding 1744 snmpd 21 0 /proc/sys/net/ipv6/neigh/lo/base_reachable_time_ms 2440 snmp-pass 4 0 /proc/cpuinfo 2440 snmp-pass 4 0 /proc/stat 22884 pickup 12 0 maildrop 2440 snmp-pass 4 0 /proc/cpuinfo 2440 snmp-pass 4 0 /proc/stat While tracing, at "ls" command was launched: the libraries it uses can be seen as they were opened. Also, the snmpd process opened various /proc and /sys files (reading metrics). was starting up: a new process). opensnoop can be useful for discovering configuration and log files, if used during application startup. There is another version of this tool in bcc: https://github.com/iovisor/bcc The bcc version provides command line options to customize the output.