随便找一个进程

yeqiang@yeqiang-MS-7B23:~$ ps aux | grep Vir
yeqiang     3538  0.4  0.6 1797056 210332 ?      Sl   08:38   0:06 /usr/lib/virtualbox/VirtualBox

查看命令行

yeqiang@yeqiang-MS-7B23:~$ strings /proc/3538/cmdline 
/usr/lib/virtualbox/VirtualBox

查看环境变量
yeqiang@yeqiang-MS-7B23:~$ strings /proc/3538/environ 
GJS_DEBUG_TOPICS=JS ERROR;JS LOG
LANGUAGE=zh_CN:zh
USER=yeqiang
XDG_SESSION_TYPE=x11
SHLVL=0
HOME=/home/yeqiang
DESKTOP_SESSION=ubuntu
GIO_LAUNCHED_DESKTOP_FILE=/usr/share/applications/virtualbox.desktop
GTK_MODULES=gail:atk-bridge
GNOME_SHELL_SESSION_MODE=ubuntu
MANAGERPID=2541
SYSTEMD_EXEC_PID=2836
DBUS_SESSION_BUS_ADDRESS=unix:path=/run/user/1000/bus
GIO_LAUNCHED_DESKTOP_FILE_PID=3538
LOGNAME=yeqiang
GTK_IM_MODULE=fcitx
JOURNAL_STREAM=8:37958
XDG_SESSION_CLASS=user
USERNAME=yeqiang
GNOME_DESKTOP_SESSION_ID=this-is-deprecated
WINDOWPATH=2
PATH=/usr/bin:/bin:/usr/sbin:/sbin
SESSION_MANAGER=local/yeqiang-MS-7B23:@/tmp/.ICE-unix/2813,unix/yeqiang-MS-7B23:/tmp/.ICE-unix/2813
INVOCATION_ID=8f969fee0aa0499b9d46ce57898a4b63
XDG_RUNTIME_DIR=/run/user/1000
XDG_MENU_PREFIX=gnome-
DISPLAY=:1
LANG=zh_CN.UTF-8
XDG_CURRENT_DESKTOP=ubuntu:GNOME
XAUTHORITY=/run/user/1000/gdm/Xauthority
XDG_SESSION_DESKTOP=ubuntu
XMODIFIERS=@im=fcitx
SSH_AGENT_LAUNCHER=gnome-keyring
SSH_AUTH_SOCK=/run/user/1000/keyring/ssh
SHELL=/bin/bash
QT_ACCESSIBILITY=1
GDMSESSION=ubuntu
GPG_AGENT_INFO=/run/user/1000/gnupg/S.gpg-agent:0:1
GJS_DEBUG_OUTPUT=stderr
QT_IM_MODULE=fcitx
PWD=/home/yeqiang
XDG_DATA_DIRS=/usr/share/ubuntu:/usr/share/gnome:/usr/local/share/:/usr/share/:/var/lib/snapd/desktop
CLUTTER_IM_MODULE=fcitx
XDG_CONFIG_DIRS=/etc/xdg/xdg-ubuntu:/etc/xdg
 

注意：使用strings查看，不要使用cat，否则换行符没有输出，全都混在一起了。