echo $(( $(echo 1 "* "{2..10}) ))

Calculate N!


2
2011-02-10 17:09:28

4 Alternatives + Submit Alt

What Others Think

calculates N! for values between 2 and 25. echo $(( $(echo 1 "* "{2..26}) )) -1569523520172457984 Kinda interesting. I'd be impressed if you could make a pascal's triangle in a one liner...
bartonski · 380 weeks ago
Interesting? I guess you are running a super computer.
RanyAlbeg · 380 weeks ago
Sorry. No supercomputers here. I did find the use of "* "{2..10} to create * 2 * 3 * 4 * 5 * 6 * 7 * 8 * 9 * 10 to be somewhat novel.
bartonski · 380 weeks ago
the pascal's triangle is a hard task... but i'm trying... I'm so close... lines=6; eval echo -e "{1..$lines}\\\n" | while read i; do eval "array$i=( $(echo {1..$i} ) ); echo \${array$((i-1))[@]}"; done; with this I can recover the array from previous line... with some more work I can do it.
glaudiston · 380 weeks ago
@glaudiston I've solved it with a couple of nested for loops, but I'm still waiting for my command to be moderated.
flatcap · 380 weeks ago
@bartonski, done, a one line pascal's triangle; l=10;for((i=0;i<$l;i++));do eval "a$i=($(pv=1;v=1;for((j=0;j<$l;j++));do [ $i -eq 0 -o $j -eq 0 ]&&{ v=1 && pv=1; }||v=$((pv+a$((i-1))[$((j))]));echo -n "$v ";pv=$v;done;));";eval "echo \"\${a$i[@]}\"";done | column -t;
glaudiston · 379 weeks and 6 days ago

What do you think?

Any thoughts on this command? Does it work on your machine? Can you do the same thing with only 14 characters?

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