linux文件时间的查看和修改touch

$ ls -l uconv.h
-rw-rw-r--  1 work work 1808 Jul 23  2013 uconv.h

$ ls -l --time=ctime uconv.h 
-rw-rw-r--  1 work work 1808 Jul 23  2013 uconv.h

$ ls -l --time=atime uconv.h
-rw-rw-r--  1 work work 1808 Dec 12  2013 uconv.h

2. 修改文件的时间

$ touch --help
Usage: touch [OPTION]... FILE...
Update the access and modification times of each FILE to the current time.

  -a                     change only the access time
                         修改访问时间
  -c, --no-create        do not create any files
                         修改文件三个时间，不存在则不创建
  -d, --date=STRING      parse STRING and use it instead of current time
                         指定时间代替当前时间
  -f                     (ignored)
  -m                     change only the modification time
                         修改mtime
  -r, --reference=FILE   use this file's times instead of current time
  -t STAMP               use [[CC]YY]MMDDhhmm[.ss] instead of current time
                         指定修改时间

$ touch -d "2 days ago" uconv.h
$ ll uconv.h ; ll --time=atime uconv.h ; ll --time=ctime uconv.h ;
-rw-rw-r--  1 work work 1808 Jun 13 18:17 uconv.h
-rw-rw-r--  1 work work 1808 Jun 13 18:17 uconv.h
-rw-rw-r--  1 work work 1808 Jun 15 18:17 uconv.h

$ touch -t 201406142020 uconv.h   

$ ll uconv.h ; ll --time=atime uconv.h ; ll --time=ctime uconv.h ;
-rw-rw-r--  1 work work 1808 Jun 14 20:20 uconv.h
-rw-rw-r--  1 work work 1808 Jun 14 20:20 uconv.h
-rw-rw-r--  1 work work 1808 Jun 15 18:23 uconv.h

$ cp -a uconv.h uconv.h1

$ ll uconv.h1 ; ll --time=atime uconv.h1 ; ll --time=ctime uconv.h1 ;
-rw-rw-r--  1 work work 1808 Jun 14 20:20 uconv.h1
-rw-rw-r--  1 work work 1808 Jun 15 18:25 uconv.h1
-rw-rw-r--  1 work work 1808 Jun 15 18:27 uconv.h1