Linux

/proc/{pid}/          #process
/proc/{pid}/exe       #executable, (also for stopped processes)
 
/proc/{pid}/cmdline
/proc/{pid}/environ
/proc/{pid}/fd
/proc/{pid}/cwd       # working directory
/proc/{pid}/net
/proc/{pid}/status
 
# open ports, assume folder /proc/{pid}/
cat ./net/tcp | awk 'NR>1 {split($2, a, ":"); printf "%d\n", "0x" a[2]}'
 
# local ip's and ports
awk 'NR>1 {
    split($2, a, ":")
    hex = a[1]
    # Extract bytes (IP is little-endian in the file)
    b1 = substr(hex,7,2); b2 = substr(hex,5,2)
    b3 = substr(hex,3,2); b4 = substr(hex,1,2)
    printf "%d.%d.%d.%d:%d\n",
        "0x"b1, "0x"b2, "0x"b3, "0x"b4,
        "0x"a[2]
}' ./net/tcp
 
 
 
# connected local ip's
cat /net/arp
cat /net/route

timedatectl status
lsmod
iptables-save
mount