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```
mktemp [options] [TMP] # 创建临时文件或文件夹
# 如不指定TMP,则默认其值为 tmp.XXXXXXXXXX，在/tmp目录下创建文件
# 如指定TMP,则它至少应包含3个‘XXX’，在当前目录下创建文件
# 一个X代表一个随机数字或字母