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create histfilesize

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Nebel 2022-08-20 00:30:18 +09:00
parent 542bcbf4dd
commit 058cb26626
3 changed files with 27 additions and 0 deletions

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histfilesize/.bashrc Normal file
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HISTFILESIZE=16777215

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histfilesize/README.md Normal file
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# Bash `HISTFILESIZE` の限界
```console
$ seq 0 $((0x7fffffff)) > .bash_history
$ wc -l .bash_history
2147483648 .bash_history
$ echo $((0x7fffffff))
2147483647
$ docker compose run --rm bash
root@ff1161946537:/# 225859065
$ wc -l .bash_history
16777215 .bash_history
```
- 225859066 行 (< 0x7fffffff bytes) まで読み込まれた
- `HISTFILESIZE=$((0x7fffffff))` 以上にするのは意味がない
- `HISTFILESIZE=$((0x7fffff))` 行に切り落とせる
- `HISTFILESIZE=$((0xffffff))` 行に切り落とせる
- `HISTFILESIZE=$((0x7fffffff))` では .bash_history が大きいとハングすることがあった
- このあたりが限界だろう
- 0xffffff 行くらいまでならおそらく OK だろう

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histfilesize/compose.yml Normal file
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services:
bash:
image: ubuntu:jammy
volumes:
- "./:/root"