tasks a-s

Task/Reverse-a-string/Sed/reverse-a-string.sed

@@ -0,0 +1,18 @@
+#!/bin/sed -f
+
+/../! b
+
+# Reverse a line.  Begin embedding the line between two newlines
+s/^.*$/\
+&\
+/
+
+# Move first character at the end.  The regexp matches until
+# there are zero or one characters between the markers
+tx
+:x
+s/\(\n.\)\(.*\)\(.\n\)/\3\2\1/
+tx
+
+# Remove the newline markers
+s/\n//g