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+# shell_quote --- quote an argument for passing to the shell
+#
+# Michael Brennan
+# brennan@madronabluff.com
+# September 2014
+
+function shell_quote(s,             # parameter
+    SINGLE, QSINGLE, i, X, n, ret)  # locals
+{
+    if (s == "")
+        return "\"\""
+
+    SINGLE = "\x27"  # single quote
+    QSINGLE = "\"\x27\""
+    n = split(s, X, SINGLE)
+
+    ret = SINGLE X[1] SINGLE
+    for (i = 2; i <= n; i++)
+        ret = ret QSINGLE SINGLE X[i] SINGLE
+
+    return ret
+}