1 files changed, 17 insertions, 0 deletions
diff --git a/os1w5/lettercount.sh b/os1w5/lettercount.sh
new file mode 100755
index 0000000..9ff3436
--- /dev/null
+++ b/os1w5/lettercount.sh
@@ -0,0 +1,17 @@
+#!/bin/sh
+
+usage() {
+	echo "usage: $0 <file> <letter1> [letter2] [letter3] [...]"
+	exit 1
+}
+
+[[ ! -f "$1" ]] && echo "file does not exist" && usage
+[[ "$#" -lt 2 ]] && echo "not enough arguments" && usage
+
+file="$1"
+shift
+for letter in "$@"; do
+	[[ ! "${#letter}" -eq 1 ]] && echo "argument \"$letter\" too long" && usage
+	echo "$letter -> `cat $file | tr -cd $letter | wc -c`"
+done
+