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historyを完全に消化

Last updated at Posted at 2020-11-25

概要

historyは「history -c」で削除できる。しかし、historyはメモリにも保管されていて、ログアウトした時にメモリから復元されてしまう。その結果、再びログインするとhistoryが再び表示される。

コマンドライン

次のスクリプトを実行すると完全に削除される。

cat /dev/null > ~/.bash_history && history -c && exit

Ansible

ディレクトリ構成

~/ansible
  |- server
     |- erase_history.yml
~/scripts
  |- server
     |- erase_script.sh

ansible-playbook

erase_history.yml

---
- name: check firewall setting
  hosts: "{{ host | default('network') }}"
  gather_facts: no

  tasks:
    - name: erase history
      shell:  "cat /dev/null > ~/.bash_history && history -c && exit"
      args:
        executable: /bin/bash

bashスクリプト

erase_history.sh

#!/bin/bash

HOST=""

usage() {
  echo "Usage: erase_history.sh [-n ホスト名] [-h ヘルプ]\nhistoryを初期化する" 1>&2
}

exit_abnormal() {
  usage
  exit 1
}

call_ansible_script() {
  cd ~/ansible/server/
  CMD="ansible-playbook erase_history.yml --ask-vault-pass"
  ARG=""
  if [ ! -z "$HOST" ]; then
    ARG="host=$HOST"
  fi
  ARG="$(echo -e "${ARG}" | sed -e 's/^[[:space:]]*//')"
  if [ ! -z "$ARG" ]; then
    CMD+=" -e \"$ARG\""
  fi
  eval ${CMD}
}

while getopts ":n:h" OPT; do
  case $OPT in
  n) HOST=${OPTARG};;
  h) usage
    exit 0
    ;;
  :) echo "-$OPTARGはホスト名が必須です"
    exit_abnormal;;
  esac
done
call_ansible_script
exit 0

以上

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