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+# Bash scripting
+
+## String manipulation
+
+Remove shortest from end
+
+    ${VAR%substr}
+    # e.g.
+    ${FILEPATH%.*}.out   # change extension from whatever to .out
+
+Remove longest from start
+
+    ${VAR#substr}
+    # e.g.
+    ${FILEPATH##*/}      # get only file name portion
+
+%% - longst from end, # - shortest from start
+
+## Control flow
+
+Loop over files
+
+    for file in glob/*; do something $file; done