bash: better default bashrc

packages/bash/etc-bash.bashrc

@@ -1,7 +1,24 @@
+# Command history tweaks:
+# - Append history instead of overwriting
+#   when shell exits.
+# - When using history substitution, do not
+#   exec command immediately.
+# - Do not save to history commands starting
+#   with space.
+# - Do not save duplicated commands.
+shopt -s histappend
+shopt -s histverify
+export HISTCONTROL="ignoreboth"
+
+# Default command line prompt.
+PROMPT_DIRTRIM=2
+PS1="\\[\\e[0;32m\\]\\w\\[\\e[0m\\] \\[\\e[0;97m\\]\\$\\[\\e[0m\\] "
+
+# Handles nonexistent commands.
+# If user has entered command which invokes non-available
+# utility, command-not-found will give a package suggestions.
 if [ -x @TERMUX_PREFIX@/libexec/termux/command-not-found ]; then
 	command_not_found_handle() {
 		@TERMUX_PREFIX@/libexec/termux/command-not-found "$1"
 	}
 fi
-
-PS1='\$ '