Generate random password of specified length (default 12 characters)

bashrc.sh

# Put this file in your ~/.bashrc. To invoke type in the command line:
# 
# genpasswd
#
# The default password length is 12 characters. If need it longer:
#
# genpasswd 24

function genpasswd() {
  local numchars=$1
  if [ -z "$numchars" ]; then
    numchars=12
  fi
  numchars=$(expr $numchars + 1 )
  numbytes=$(expr $numchars + 20 )
  openssl rand -base64 $numbytes | \
    xargs echo | \
    sed -e 's%/%%g' -e 's%=%%g' -e 's%\+%%g' -e 's% %%g' | \
    tail -c -$numchars
}