generate a random password and save the string in a PDF file

random_password.sh

# !/bin/sh
# generate a random password and save the string in a PDF file
# 7 letters ( upppers and lowers), except "l" and "O" to better legibility 
# 4 numbers (1 to 9)
# 3 special chars of @,! or _

convert --version > /dev/null 2>/dev/null || (echo "Error: you need imagemagick" && exit )
passwd_p1=`tr -dc 'A-NQ-Za-km-z' </dev/urandom | head -c 7`
passwd_p2=`tr -dc '1-9' </dev/urandom | head -c 4`
passwd_p3=`tr -dc '@!_' </dev/urandom | head -c 3`

passwd=`echo ${passwd_p1}${passwd_p3}${passwd_p2} | sed 's/./&\n/g' | shuf | shuf | tr -d "\n"` 
mydate=`date +%Y%m%d_%H%M%S`

convert -size 260x60 -font "DejaVu-Sans-Mono" -pointsize 16 -fill black caption:"${passwd}" ${mydate}_yourpass.pdf
echo ${mydate}_yourpass.pdf generated