0
Check which files are opened by the program
lsof -p $(pidof -s systemd)systemd 2594 root txt REG 254,0 1739200 28577792 /usr/lib/systemd/systemd
systemd 2594 root mem REG 254,0 149576 28574681 /usr/lib/x86_64-linux-gnu/libgpg-error.so.0.29.0
systemd 2594 root mem REG 254,0 3076960 28573725 /usr/lib/x86_64-linux-gnu/libcrypto.so.1.1
systemd 2594 root mem REG 254,0 26984 28574568 /usr/lib/x86_64-linux-gnu/libcap-ng.so.0.0.0
systemd 2594 root DEL REG 254,0 28575891 /usr/lib/x86_64-linux-gnu/libpcre2-8.so.0.10.1
systemd 2594 root mem REG 254,0 149520 28574409 /usr/lib/x86_64-linux-gnu/libpthread-2.31.so
systemd 2594 root mem REG 254,0 18688 28574396 /usr/lib/x86_64-linux-gnu/libdl-2.31.so
systemd 2594 root mem REG 254,0 158400 28574079 /usr/lib/x86_64-linux-gnu/liblzma.so.5.2.5
systemd 2594 root mem REG 254,0 890800 28574008 /usr/lib/x86_64-linux-gnu/libzstd.so.1.4.8
systemd 2594 root mem REG 254,0 137568 28574718 /usr/lib/x86_64-linux-gnu/liblz4.so.1.9.3
systemd 2594 root mem REG 254,0 35280 28577619 /usr/lib/x86_64-linux-gnu/libip4tc.so.2.0.0
systemd 2594 root mem REG 254,0 1176248 28574693 /usr/lib/x86_64-linux-gnu/libgcrypt.so.20.2.8
systemd 2594 root mem REG 254,0 202680 28573709 /usr/lib/x86_64-linux-gnu/libcrypt.so.1.1.0
systemd 2594 root mem REG 254,0 38864 28577608 /usr/lib/x86_64-linux-gnu/libcap.so.2.44
systemd 2594 root mem REG 254,0 326624 28575507 /usr/lib/x86_64-linux-gnu/libblkid.so.1.1.0
systemd 2594 root mem REG 254,0 38936 28574106 /usr/lib/x86_64-linux-gnu/libacl.so.1.1.2253
systemd 2594 root mem REG 254,0 1839792 28573722 /usr/lib/x86_64-linux-gnu/libc-2.31.so
systemd 2594 root mem REG 254,0 76480 28577610 /usr/lib/x86_64-linux-gnu/libapparmor.so.1.6.3
systemd 2594 root mem REG 254,0 108592 28577621 /usr/lib/x86_64-linux-gnu/libkmod.so.2.3.6
systemd 2594 root mem REG 254,0 128952 28574575 /usr/lib/x86_64-linux-gnu/libaudit.so.1.0.0
systemd 2594 root mem REG 254,0 67584 28573740 /usr/lib/x86_64-linux-gnu/libpam.so.0.85.1
systemd 2594 root mem REG 254,0 375424 28575862 /usr/lib/x86_64-linux-gnu/libmount.so.1.1.0
systemd 2594 root mem REG 254,0 166120 28575899 /usr/lib/x86_64-linux-gnu/libselinux.so.1
systemd 2594 root mem REG 254,0 137536 28574795 /usr/lib/x86_64-linux-gnu/libseccomp.so.2.5.1
systemd 2594 root mem REG 254,0 39912 28574412 /usr/lib/x86_64-linux-gnu/librt-2.31.so
systemd 2594 root mem REG 254,0 2692512 28577641 /usr/lib/systemd/libsystemd-shared-247.so
systemd 2594 root mem REG 254,0 177928 28573717 /usr/lib/x86_64-linux-gnu/ld-2.31.so
systemd 2594 root 0r CHR 1,3 0t0 4 /dev/null
systemd 2594 root 1u unix 0x00000000190acce2 0t0 22960 type=STREAM
systemd 2594 root 2u unix 0x00000000190acce2 0t0 22960 type=STREAM
systemd 2594 root 3u unix 0x0000000025b514fc 0t0 22979 type=DGRAM
systemd 2594 root 4u a_inode 0,13 0 9065 [eventpoll]
systemd 2594 root 5u a_inode 0,13 0 9065 [signalfd]
systemd 2594 root 6r a_inode 0,13 0 9065 inotify
systemd 2594 root 7r DIR 0,28 0 9234 /sys/fs/cgroup/user.slice/user-0.slice/user@0.service
systemd 2594 root 8u a_inode 0,13 0 9065 [timerfd]
systemd 2594 root 9u a_inode 0,13 0 9065 [eventpoll]
systemd 2594 root 10r REG 0,21 0 23002 /proc/2594/mountinfo
systemd 2594 root 11r a_inode 0,13 0 9065 inotify
systemd 2594 root 12u unix 0x0000000042e0087e 0t0 23016 /run/user/0/bus type=STREAM
systemd 2594 root 13r a_inode 0,13 0 9065 inotify
systemd 2594 root 14r REG 0,21 0 4026532085 /proc/swaps
systemd 2594 root 15u netlink 0t0 23003 KOBJECT_UEVENT
systemd 2594 root 16u unix 0x000000006a60956b 0t0 23007 /run/user/0/systemd/notify type=DGRAM
systemd 2594 root 17u unix 0x00000000aefe9498 0t0 23008 type=DGRAM
systemd 2594 root 18u unix 0x000000007ebccb44 0t0 23009 type=DGRAM
systemd 2594 root 19u unix 0x00000000ce35dc18 0t0 23010 /run/user/0/systemd/private type=STREAM
systemd 2594 root 20u unix 0x0000000037072b9c 0t0 23012 type=STREAM
systemd 2594 root 21u a_inode 0,13 0 9065 [timerfd]
systemd 2594 root 26u unix 0x00000000ec880f22 0t0 23018 /run/user/0/gnupg/S.dirmngr type=STREAM
systemd 2594 root 27u unix 0x00000000ad9ccd83 0t0 23020 /run/user/0/gnupg/S.gpg-agent.browser type=STREAM
systemd 2594 root 28u unix 0x00000000bb03707f 0t0 23022 /run/user/0/gnupg/S.gpg-agent.extra type=STREAM
systemd 2594 root 29u unix 0x000000006f917334 0t0 23024 /run/user/0/gnupg/S.gpg-agent.ssh type=STREAM
systemd 2594 root 30u unix 0x000000003e44798e 0t0 23026 /run/user/0/gnupg/S.gpg-agent type=STREAM
systemd 2594 root 31u unix 0x00000000ddbfe82b 0t0 23028 /run/user/0/pk-debconf-socket type=STREAMlsof
Lsof revision 4.93.2 lists on its standard output file information about files opened by processes for the following UNIX dialects:Apple Darwin 9 and Mac OS X 10.[567] FreeBSD 8.[234], 9.0 and 1[012].0 for AMD64-based systems Linux 2.1.72 and above for x86-based systems Solaris 9, 10 and 11
(See the DISTRIBUTION section of this manual page for information on how to obtain the latest lsof revision.)
An open file may be a regular file, a directory, a block special file, a character special file, an executing text reference, a library, a stream or a network file (Internet socket, NFS file or UNIX domain socket.) A specific file or all the files in a file system may be selected by path.
Instead of a formatted display, lsof will produce output that can be parsed by other programs. See the -F, option description, and the OUTPUT FOR OTHER PROGRAMS section for more information.
In addition to producing a single output list, lsof will run in repeat mode. In repeat mode it will produce output, delay, then repeat the output operation until stopped with an interrupt or quit signal. See the +|-r [t[m<fmt>]] option description for more information.
pidof
Pidof finds the process id's (PIDs) of the named programs. It prints those id's on the standard output. This program is on some systems used in run-level change scripts, especially when the system has a System-V like rc structure. In that case these scripts are located in /etc/rc?.d, where ? is the runlevel. If the system has a start-stop-daemon (8) program that should be used instead.Comments