Linux命令學習（四）：file命令

        今天在關注重慶那顆釘子的問題，所以沒看書。只說一個命令吧。file命令，用於顯示檔案的類型（如是文字檔還是檔案夾等等）。

Usage: file [OPTION]... [FILE]...
Determine file type of FILEs.

  -m, --magic-file LIST      use LIST as a colon-separated list of magic
                               number files
  -z, --uncompress           try to look inside compressed files
  -b, --brief                do not prepend filenames to output lines
  -c, --checking-printout    print the parsed form of the magic file, use in
                               conjunction with -m to debug a new magic file
                               before installing it
  -f, --files-from FILE      read the filenames to be examined from FILE
  -F, --separator string     use string as separator instead of `:'
  -i, --mime                 output mime type strings
  -k, --keep-going           don't stop at the first match
  -L, --dereference          causes symlinks to be followed
  -n, --no-buffer            do not buffer output
  -N, --no-pad               do not pad output
  -p, --preserve-date        preserve access times on files
  -r, --raw                  don't translate unprintable chars to \ooo
  -s, --special-files        treat special (block/char devices) files as
                             ordinary ones
      --help                 display this help and exit
      --version              output version information and exit