o0-o

# password.sh

declare -r length=$(($(($RANDOM%17))+23)) 2>/dev/null && #23-39

( #openssl
  openssl rand -base64 "${length-32}" ||
  
  #os random
  base64 < /dev/urandom |
    fold --width="${length-32}" | 

o0-o

# uuid.sh

uuidgen 2>/dev/null ||

exit 1 #fail

exit 0 #success

o0-o

# net_mac_addresses.sh

( # linux (NetworkManager)
  nmcli -terse -fields GENERAL.HWADDR device show ||
  
  # macos
  networksetup -listallhardwareports ||

  # linux/bsd
  ( ip address || ifconfig ) |

o0-o

# net_if.sh

( # linux
  file /sys/class/net/* |
    sed 's/.*\///g' ||

  # macos
  networksetup -listallhardwareports |
    grep "Device:" |
    awk '{ print $2 }' ||

o0-o

# net_ip4.sh

( # linux (NetworkManager)
  nmcli -terse -mode tabular -fields IP4.ADDRESS device show ||
  
  # linux (iproute2)
  ip -family inet -brief address |

  # linux/bsd
  ( ip address || ifconfig ) | 

o0-o

# math_round.sh
#
# parameter: number (float)
# example: 3.14

( echo "$1" |
    awk '{
        x=$1
        ival = int(x)    # integer part, int() truncates
        # see if fractional part

o0-o

# mem.sh

( # linux
  grep "MemTotal" /proc/meminfo |
    awk '{ printf "%d\n", $2 * 1000 }' ||
    
  # bsd
  sysctl -n hw.realmem 2>/dev/null ||

  # macos

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# host_name.sh

hostname 2>/dev/null ||

exit 1 #failure

exit 0 #success

o0-o

# cpu_aes.sh

( # linux
  lscpu |
    grep --quiet "aes" ||
    
  # bsd
  sysctl dev. |
    grep --quiet "aes" ||

o0-o

# disks.sh

( # linux
  lsblk --all --noheadings --list --output NAME,TYPE |
    grep disk |
    sed 's/[[:space:]]disk//g' ||
  
  # bsd
  geom disk list |
    grep "Geom name: " |