diff options
Diffstat (limited to 'bin/myb')
-rwxr-xr-x | bin/myb | 22 |
1 files changed, 22 insertions, 0 deletions
diff --git a/bin/myb b/bin/myb new file mode 100755 index 00000000..57a37ad5 --- /dev/null +++ b/bin/myb @@ -0,0 +1,22 @@ +#!/bin/sh +# Exit with success or failure with a given probability +self=myb + +# No more than one argument +if [ "$#" -gt 1 ] ; then + printf >&2 '%s: Unexpected arguments\n' "$self" + exit 2 +fi + +# Sole accepted argument is denominator of the probability fraction, e.g. 3 is +# a probability of 1/3; defaults to 2 +denom=${1:-2} + +# Denominator must be positive integer (it can be one) +if [ "$((denom > 0))" -ne 1 ] ; then + printf >&2 '%s: Illegal denominator %s\n' "$self" "$denom" + exit 2 +fi + +# Perform the test; that's our exit value +test "$(rndi 1 "$denom")" -eq 1 |