initial

linux/terminal/.bashrc

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+# append to the history file, don't overwrite it
+shopt -s histappend
+
+# update history before executing commands
+PROMPT_COMMAND="history -a;$PROMPT_COMMAND"
+
+# check the window size after each command and, if necessary,
+# update the values of LINES and COLUMNS.
+shopt -s checkwinsize