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血的教训！解锁 source 命令新的姿势，已准备跑路。
source link: https://www.v2ex.com/t/527839
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程序员 - @shayuvpn0001 - 刚刚脑子也是抽了，觉得 history 里面 clear, exit, pwd 这种垃圾太多，总翻不到自己想找的以前的命令（某个 grep 正则表达式），于是准备拿.bash\_history 开刀，
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