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Prints the distribution of primes in the terminal using OpenSSL
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| #!/bin/sh | |
| die () { | |
| echo $1 | |
| exit $2 | |
| } | |
| red () { | |
| if [ -x $(which tput) ]; then | |
| tput setaf 1 | |
| fi | |
| } | |
| blue () { | |
| if [ -x $(which tput) ]; then | |
| tput setaf 4 | |
| fi | |
| } | |
| yellow () { | |
| if [ -x $(which tput) ]; then | |
| tput setaf 3 | |
| fi | |
| } | |
| term_reset () { | |
| if [ -x $(which tput) ]; then | |
| tput sgr0 | |
| fi | |
| } | |
| check_openssl () { | |
| openssl=$(which openssl) | |
| test -x $openssl || die "can't find openssl - is it installed?" 1 | |
| } | |
| status () { | |
| yellow | |
| printf "[$(basename $0)] " | |
| term_reset | |
| echo "${@}" | |
| } | |
| hide_cursor () { | |
| tput civis | |
| } | |
| show_cursor () { | |
| tput cnorm | |
| } | |
| main () { | |
| check_openssl | |
| status "print the distribution of primes using openssl!" | |
| echo | |
| status "enter the upper limit to count to -" | |
| read ulimit | |
| echo | |
| red | |
| printf "|" | |
| term_reset | |
| echo " = prime" | |
| blue | |
| printf "." | |
| term_reset | |
| echo " = composite" | |
| echo | |
| trap echo EXIT | |
| hide_cursor | |
| for num in $(seq 1 ${ulimit:-1000}); | |
| do | |
| $openssl prime $num | grep --quiet 'is prime' 2>&1; | |
| case $? in | |
| 0) red; /bin/echo -n '|'; term_reset ;; | |
| *) blue; /bin/echo -n '.'; term_reset ;; | |
| esac | |
| done | |
| show_cursor | |
| } | |
| main |
Author
andrewh
commented
Apr 13, 2016
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