Linux:echo、read、cat命令

1、echo

  不换行 -n

举例：echo –n “My name is:”
   执行命令：

      举例：

[code]kevin@kevin:~/mybash$echo "My home dir is:$HOME  my current dir is:`pwd`"

My home dir is:/home/kevin my current dir is:/home/kevin/mybash

kevin@kevin:~/mybash$

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2、read

用于给变更赋值

[code]kevin@kevin:~/mybash$read myname

kevin

kevin@kevin:~/mybash$echo $myname

kevin

kevin@kevin:~/mybash$read yourname age address

kevin30 beijing.china  

kevin@kevin:~/mybash$echo $yourname

kevin

kevin@kevin:~/mybash$echo $age

30

kevin@kevin:~/mybash$echo $address

beijing.china

kevin@kevin:~/mybash$

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3、cat

  1、创件文件

[code]kevin@kevin:~/mybash$cat > tmplog

create file by cat

kevin@kevin:~/mybash$ll

总用量 16

drwxr-xr-x  2 kevinkevin4096 2012-09-15 16:08 ./

drwxr-xr-x 44 kevinkevin4096 2012-09-15 15:43 ../

-rwxr-xr-x  1 kevinkevin  47 2012-09-15 15:43 test.sh*

-rw-r--r--  1 kevinkevin  19 2012-09-15 16:08 tmplog

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2、查看文件，合并多个文件

[code]kevin@kevin:~/mybash$ll

总用量 16

drwxr-xr-x  2 kevinkevin4096 2012-09-15 16:08 ./

drwxr-xr-x 44 kevinkevin4096 2012-09-15 15:43 ../

-rwxr-xr-x  1 kevinkevin  47 2012-09-15 15:43 test.sh*

-rw-r--r--  1 kevinkevin  19 2012-09-15 16:08 tmplog

kevin@kevin:~/mybash$cat tmplog 

create file by cat

kevin@kevin:~/mybash$cat tmplog test.sh > all.log

kevin@kevin:~/mybash$ll

总用量 20

drwxr-xr-x  2 kevinkevin4096 2012-09-15 16:11 ./

drwxr-xr-x 44 kevinkevin4096 2012-09-15 15:43 ../

-rw-r--r--  1 kevinkevin  66 2012-09-15 16:11 all.log

-rwxr-xr-x  1 kevinkevin  47 2012-09-15 15:43 test.sh*

-rw-r--r--  1 kevinkevin  19 2012-09-15 16:08 tmplog

kevin@kevin:~/mybash$cat all.log 

create file by cat

#/usr/bin/bash

echo "My name is:\c"

read name

kevin@kevin:~/mybash$

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