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# **touch**
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## 说明
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**touch命令** 有两个功能：一是用于把已存在文件的时间标签更新为系统当前的时间（默认方式），它们的数据将原封不动地
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保留下来；二是用来创建新的空文件
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## 选项
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```markdown
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-a：或--time=atime或--time=access或--time=use 只更改存取时间；
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-c：或--no-create 不建立任何文件；
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-d：<时间日期> 使用指定的日期时间，而非现在的时间；
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-f：此参数将忽略不予处理，仅负责解决BSD版本touch指令的兼容性问题；
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-m：或--time=mtime或--time=modify 只更该变动时间；
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-r：<参考文件或目录> 把指定文件或目录的日期时间，统统设成和参考文件或目录的日期时间相同；
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-t：<日期时间> 使用指定的日期时间，而非现在的时间；
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用法：touch [选项]... 文件...
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Update the access and modification times of each FILE to the current time.
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A FILE argument that does not exist is created empty, unless -c or -h
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is supplied.
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A FILE argument string of - is handled specially and causes touch to
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change the times of the file associated with standard output.
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Mandatory arguments to long options are mandatory for short options too.
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-a 只更改访问时间
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-c, --no-create 不创建任何文件
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-d, --date=字符串 使用指定字符串表示时间而非当前时间
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-f (忽略)
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-h, --no-dereference 会影响符号链接本身，而非符号链接所指示的目的地
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(当系统支持更改符号链接的所有者时，此选项才有用)
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-m 只更改修改时间
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-r, --reference=FILE use this file's times instead of current time
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-t STAMP use [[CC]YY]MMDDhhmm[.ss] instead of current time
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--time=WORD change the specified time:
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WORD is access, atime, or use: equivalent to -a
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WORD is modify or mtime: equivalent to -m
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请注意，-d 和-t 选项可接受不同的时间/日期格式
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```
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## 实例
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```bash
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touch -c -t 0304050607 file # 改变文件file的时间标签
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```
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