Option to preserve bash history

README.rst

 ``/etc/skel/.bashrc``). This formula will do this automatically, but will not
 touch existing user's ``~/.bashrc`` files except root.
 
+Bash
+~~~~
+
+Fix bash configuration to preserve history across sessions (like ZSH does by
+default).
+
+.. code-block:: yaml
+
+    linux:
+      system:
+        bash:
+          preserve_history: true
+
 Message of the day
 ~~~~~~~~~~~~~~~~~~
 

linux/files/bash_history.sh

+{%- from "linux/map.jinja" import system with context %}
+
+# History across sessions for Bash
+if [ -n "$BASH_VERSION" ]; then
+  # Avoid duplicates
+  export HISTCONTROL=ignoredups:erasedups
+  # When the shell exits, append to the history file instead of overwriting it
+  shopt -s histappend
+
+  # After each command, append to the history file and reread it
+  export PROMPT_COMMAND="${PROMPT_COMMAND:+$PROMPT_COMMAND$'\n'}history -a; history -c; history -r"
+fi

linux/system/bash.sls

+{%- from "linux/map.jinja" import system with context %}
+{%- if system.enabled %}
+
+{%- if system.bash.get('preserve_history', False) %}
+/etc/profile.d/bash_history.sh:
+  file.managed:
+    - source: salt://linux/files/bash_history.sh
+    - template: jinja
+{%- endif %}
+
+{%- endif %}

linux/system/init.sls

 {%- if system.prompt is defined %}
 - linux.system.prompt
 {%- endif %}
+{%- if system.bash is defined %}
+- linux.system.bash
+{%- endif %}
 {%- if system.user|length > 0 %}
 - linux.system.user
 {%- endif %}