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number to binary
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| LC_ALL=C | |
| case $1 in | |
| ''|[!0-9]*|[!0]*[!0-9]*|0[!0-7Xx]*|0[Xx]|0[!Xx]*[!0-7]*|0[Xx]*[!0-9A-Fa-f]*) | |
| printf '%s: invalid number: %s\n' "$0" "$1" >&2 | |
| exit 1 | |
| esac | |
| x=$(($1)) bx= | |
| while test $x -gt 0; do | |
| bx=$((x & 1))$bx x=$((x >> 1)) | |
| done | |
| printf '%s\n' ${bx:-0} | |
| # vim: ft=sh |
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