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[linux] CentOS looks at the directory location where the program is running

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Posted on 11/9/2016 1:07:12 PM | | | |


Let's take the memcached process as an example,

We don't run with root privileges.

Task: View processes running non-root
When Linux starts a process, the system will create a folder named PID under /proc, under which there will be information about our process, including a file called exe that records the absolute path, which can be viewed through the ll or ls –l command.

ll /proc/PID


dr-xr-xr-x 2 www  www  0 Nov  9 12:42 attr
-rw-r--r-- 1 root root 0 Nov  9 12:42 autogroup
-r-------- 1 root root 0 Nov  9 12:42 auxv
-r--r--r-- 1 root root 0 Nov  9 12:42 cgroup
--w------- 1 root root 0 Nov  9 12:42 clear_refs
-r--r--r-- 1 root root 0 Oct 26 16:15 cmdline
-rw-r--r-- 1 root root 0 Nov  9 12:42 comm
-rw-r--r-- 1 root root 0 Nov  9 12:42 coredump_filter
-r--r--r-- 1 root root 0 Nov  9 12:42 cpuset
lrwxrwxrwx 1 root root 0 Oct 30 12:58 cwd -> /
-r-------- 1 root root 0 Nov  9 12:42 environ
lrwxrwxrwx 1 root root 0 Oct 26 16:15 exe -> /alidata/server/memcached/bin/memcached
dr-x------ 2 root root 0 Nov  9 12:42 fd
dr-x------ 2 root root 0 Nov  9 12:42 fdinfo
-r-------- 1 root root 0 Nov  9 12:42 io
-rw------- 1 root root 0 Nov  9 12:42 limits
-rw-r--r-- 1 root root 0 Nov  9 12:42 loginuid
-r--r--r-- 1 root root 0 Nov  9 12:42 maps
-rw------- 1 root root 0 Nov  9 12:42 mem
-r--r--r-- 1 root root 0 Nov  9 12:42 mountinfo
-r--r--r-- 1 root root 0 Nov  9 12:42 mounts
-r-------- 1 root root 0 Nov  9 12:42 mountstats
dr-xr-xr-x 4 www  www  0 Nov  9 12:42 net
dr-x--x--x 2 root root 0 Nov  9 12:42 ns
-r--r--r-- 1 root root 0 Nov  9 12:42 numa_maps
-rw-r--r-- 1 root root 0 Nov  9 12:42 oom_adj
-r--r--r-- 1 root root 0 Nov  9 12:42 oom_score
-rw-r--r-- 1 root root 0 Nov  9 12:42 oom_score_adj
-r--r--r-- 1 root root 0 Nov  9 12:42 pagemap
-r--r--r-- 1 root root 0 Nov  9 12:42 personality
lrwxrwxrwx 1 root root 0 Nov  9 12:42 root -> /
-rw-r--r-- 1 root root 0 Nov  9 12:42 sched
-r--r--r-- 1 root root 0 Nov  9 12:42 schedstat
-r--r--r-- 1 root root 0 Nov  9 12:42 sessionid
-r--r--r-- 1 root root 0 Nov  9 12:42 smaps
-r--r--r-- 1 root root 0 Nov  9 12:42 stack
-r--r--r-- 1 root root 0 Oct 26 16:15 stat
-r--r--r-- 1 root root 0 Nov  9 12:42 statm
-r--r--r-- 1 root root 0 Oct 26 16:15 status
-r--r--r-- 1 root root 0 Nov  9 12:42 syscall
dr-xr-xr-x 8 www  www  0 Nov  9 12:42 task
-r--r--r-- 1 root root 0 Nov  9 12:42 wchan






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