PID USER      PR  NI  VIRT  RES  SHR S %CPU %MEM    TIME+  COMMAND
    23546 user 20   0 55596 5428  808 S  0.7  0.1   0:01.52 httpd.pl

COMMAND   PID     USER   FD   TYPE    DEVICE SIZE/OFF    NODE NAME
httpd.pl 5182 luckyove    3u  IPv4 168936033      0t0     TCP *:39331 (LISTEN)

#ls -l /proc/PID/cwd
#cat /proc/PID/environ | tr '' 'n'
#ps -p PID -o command

-bash-4.1# cat testing.pl
#!/usr/bin/perl
print `ps $$`;
$0="my_name_is_httpd.pl .. honest";
print `ps $$`;
-bash-4.1#

-bash-4.1# ./testing.pl
  PID TTY      STAT   TIME COMMAND
 6762 pts/0    S+     0:00 /usr/bin/perl ./testing.pl
  PID TTY      STAT   TIME COMMAND
 6762 pts/0    S+     0:00 my_name_is_httpd.pl .. honest
-bash-4.1#