Linux系统中file命令的使用详解
这篇文章主要介绍了Linux系统中file命令的使用详解,是Linux入门学习中的基础知识,需要的朋友可以参考下命令简介:
该命令用来识别文件类型,也可用来辨别一些文件的编码格式。它是通过查看文件的头部信息来获取文件类型,而不是像Windows通过扩展名来确定文件类型的。
执行权限 :All User
指令所在路径:/usr/bin/file
命令语法:
代码如下:
file [ -bchikLnNprsvz ] [ -f namefile ] [ -F separator ] [ -m magicfiles ] file ...命令参数:
下表列出了部分常用的参数。
使用示例:
1:查看file命令的帮助信息
代码如下:
# file --help
Usage: 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 beforeinstalling 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
当然你也可以使用 man file 获取更加详细的帮助文档信息。
2:不输出文件名称,只显示文件格式以及编码
通过下面两个命令对时,就可以清晰的了解参数-b的作用。
代码如下:
# file Temp.txt Temp.txt: UTF-8 Unicode text, with very long lines, with CRLF line terminators# file -b Temp.txtUTF-8 Unicode text, with very long lines, with CRLF line terminators
3: 输出mime类型的字符串
代码如下:
# file -i Temp.txt Temp.txt: text/plain; charset=utf-8
4: 查看文件中的文件名的文件类型
这个参数非常适合shell脚本去查找、判别某种文件类型的数据。
你可以像下面这样使用 file 命令确定文件的类型。下面的截图显示了用 file 命令确定不同文件类型的例子。
代码如下:
tecmint@tecmint ~/Linux-Tricks $ dir
BACKUP master.zip
crossroads-stable.tar.gz num.txt
EDWARD-MAYA-2011-2012-NEW-REMIX.mp3 reggea.xspf
Linux-Security-Optimization-Book.gif tmp-link
tecmint@tecmint ~/Linux-Tricks $ file BACKUP/
BACKUP/: directory
tecmint@tecmint ~/Linux-Tricks $ file master.zip
master.zip: Zip archive data, at least v1.0 to extract
tecmint@tecmint ~/Linux-Tricks $ file crossroads-stable.tar.gz
crossroads-stable.tar.gz: gzip compressed data, from Unix, last modified: Tue Apr 5 15:15:20 2011
tecmint@tecmint ~/Linux-Tricks $ file Linux-Security-Optimization-Book.gif
Linux-Security-Optimization-Book.gif: GIF image data, version 89a, 200 x 259
tecmint@tecmint ~/Linux-Tricks $ file EDWARD-MAYA-2011-2012-NEW-REMIX.mp3
EDWARD-MAYA-2011-2012-NEW-REMIX.mp3: Audio file with ID3 version 2.3.0, contains: MPEG ADTS, layer III, v1, 192 kbps, 44.1 kHz, JntStereo
tecmint@tecmint ~/Linux-Tricks $ file /dev/sda1
/dev/sda1: block special
tecmint@tecmint ~/Linux-Tricks $ file /dev/tty1
/dev/tty1: character special5:尝试去解读压缩文件的内容
代码如下:
# file -z Temp.txt.gz Temp.txt.gz: UTF-8 Unicode text, with very long lines, with CRLF line terminators (gzip compressed data, was "Temp.txt", from Unix, last modified: Tue Jun 24 00:34:15 2014)#
6: 查看软链接对应文件的文件类型
如下所示,创建一个软链接sfile,然后分别用file 和带参数的file -L查看
代码如下:
# ln -s Temp.txt.gz sfile# file sfile sfile: symbolic link to `Temp.txt.gz'# file -L sfile sfile: gzip compressed data, was "Temp.txt", from Unix, last modified: Tue Jun 24 00:34:15 2014#
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