Add ax(1)

1 files changed, 43 insertions, 0 deletions

diff --git a/bin/ax b/bin/ax
new file mode 100755
index 00000000..3840acf5
--- /dev/null
+++ b/bin/ax
@@ -0,0 +1,43 @@
+#!/bin/sh
+
+# ax(1): Evaluate an Awk expression given on the command line with an optional
+# format.
+
+# Usage function
+usage() {
+    printf 'ax: USAGE: ax [format] expression\n'
+}
+
+# Check number of arguments
+case $# in
+
+    # If one argument, we assume format is %s
+    1) form=%s expr=$1 ;;
+
+    # If two arguments, first is format, second expression
+    2) form=$1 expr=$2 ;;
+
+    # Any other number of arguments is wrong
+    *)
+        usage >&2
+        exit 2
+        ;;
+esac
+
+# Give help if requested
+case $1 in
+    -h|--help|-\?)
+        usage
+        exit 0
+        ;;
+esac
+
+# Form program
+prog=$(printf '
+    BEGIN {
+        printf "%s\\n", %s
+    }
+' "$form" "$expr")
+
+# Run the program
+awk "$prog"