linux的常用命令cat

cat命令：

$man cat

CAT(1)                           User Commands                          CAT(1)

NAME
       cat - concatenate files and print on the standard output

SYNOPSIS
       cat [OPTION]... [FILE]...

DESCRIPTION
       Concatenate FILE(s), or standard input, to standard output.

       -A, --show-all
              equivalent to -vET

       -b, --number-nonblank
              number nonempty output lines

       -e     equivalent to -vE

       -E, --show-ends
              display $ at end of each line

       -n, --number
              number all output lines

       -s, --squeeze-blank
              suppress repeated empty output lines

       -t     equivalent to -vT

       -T, --show-tabs
              display TAB characters as ^I

       -u     (ignored)

       -v, --show-nonprinting
              use ^ and M- notation, except for LFD and TAB

       --help display this help and exit

       --version
              output version information and exit

       With no FILE, or when FILE is -, read standard input.

EXAMPLES
       cat f - g
              Output f's contents, then standard input, then g's contents.

       cat    Copy standard input to standard output.

AUTHOR
       Written by Torbjorn Granlund and Richard M. Stallman.

REPORTING BUGS
       Report cat bugs to [e-mail]
       GNU coreutils home page: <http://www.gnu.org/software/coreutils/>
       General help using GNU software: <http://www.gnu.org/gethelp/>
       Report cat translation bugs to <http://translationproject.org/team/>

COPYRIGHT
       Copyright  ©  2010  Free Software Foundation, Inc.  License GPLv3+: GNU
       GPL version 3 or later <http://gnu.org/licenses/gpl.html>.
       This is free software: you are free  to  change  and  redistribute  it.
       There is NO WARRANTY, to the extent permitted by law.

SEE ALSO
       The  full  documentation for cat is maintained as a Texinfo manual.  If
       the info and cat programs are properly installed at your site, the com‐
       mand

              info coreutils 'cat invocation'

       should give you access to the complete manual.

GNU coreutils 8.5                  June 2010                            CAT(1)
 Manual page cat(1) line 41/80 (END)

具体例子，

explore@ubuntu:~/Documents$ cat -n ff.c gg.c
     1    test:
     2    cat 的使用方法
     3    精通C语言，数据结构
     4    熟悉Shell/Makefile/GCC/GDB
     5    linux内核的制定和迁移
     6    Boot Loader的配置
     7    文件系统构建
     8    linux qt
     9    TCP/IP协议，Socket编程
    10