Convert decimal numbers to binary

function decToBin { echo "ibase=10; obase=2; $1" | bc; }
Convert some decimal numbers to binary numbers. You could also build a general base-converter: function convBase { echo "ibase=$1; obase=$2; $3" | bc; } then you could write function decToBun { convBase 10 2 $1; }
Sample Output
$ for i in {0..10}; do decToBin $i; done
0
1
10
11
100
101
110
111
1000
1001
1010

3
By: woxidu
2009-11-24 22:57:58

1 Alternatives + Submit Alt

  • If you should happen to find yourself needing some binary numbers, this is a quickie way of doing it. If you need more digits, just add more "{0..1}" sequences for each digit you need. You can assign them to an array, too, and access them by their decimal equivalent for a quickie binary to decimal conversion (for larger values it's probably better to use another method). Note: this works in bash, ksh and zsh. For zsh, though, you'll need to issue a setopt KSH_ARRAYS to make the array zero-based. binary=({0..1}{0..1}{0..1}{0..1}) echo ${binary[9]} Show Sample Output


    17
    echo {0..1}{0..1}{0..1}{0..1}
    dennisw · 2009-06-23 17:30:20 5

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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