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--- task_boiler [2023/08/11 14:36] – raju
+++ task_boiler [2024/01/23 22:55] (current) – raju
@@ Line 3: / Line 3: @@
 Start the first heading with "====="
-===== remove lines with duplicate letters =====
-==== Task ====
-Find five letter words made up of letters {h, i, k, e, r, s} where each letter appears only once.
-==== Issue ====
-If we do
-<code>
-grep -i "^[hikers][hikers][hikers][hikers][hikers]$" /usr/share/dict/american-english
-<code>
-shows
-<code>
-Essie
-Hesse
-Irish
-Kerri
-Reese
-Sheri
-...
-</code>
-some of the words have the letters duplicated. For example, in 'Irish' the letter 'i' is repeated twice. Such words should be filtered out.
-==== Solution ====
-<code>
- % grep -i "^[hikers][hikers][hikers][hikers][hikers]$" /usr/share/dict/american-english | grep -viE '(.).*\1'
-Sheri
-Shrek
-heirs
-hiker
-hikes
-hires
-sheik
-shire
-shirk
-skier
-</code>