bash aliases

# Generate random passwords of arbitrary length
#  - with no arguments genpasswd will produce a 20 character random password
#  - genpasswd alos accepts an integer value to produce random passwords of
#    arbitrary length (within the limits of the random source)
create_passwd ()
{
    local i=$1
    [ "$i" == "" ] && i=20
#   uses /dev/random as the random source - slower 'more random'
#   tr -dc A-Za-z0-9_ < /dev/random | head -c ${i} | xargs
#   uses /dev/urandom as the random source- faster 'less random'
    tr -dc A-Za-z0-9_ < /dev/urandom | head -c ${i} | xargs
}

# Generate ssh key pairs
# - requires ssh-keygen
# - generates strong key pairs
# - key pairs are uniquely identifiable
create_ssh ()
{
    ssh-keygen -b 4096 -v -C "$(whoami)@$(hostname) $(date +"%F-%T (%A %B %d %Y %H:%M %Z %z)")"
}