这个要怎么写？

xiaobaibbb

read input
if [ $input != $(ls -l $input|grep '^d') ]
echo "failed"

if这行是想判断输入的文件名，如果不是文件夹就echo failed

但是怎么让if 里面的执行对比，而不是直接执行命令呢？

如果read input我输入abc （假如abc这个文件存在）

运行后就会出现
: abc  command not found

shell 把input给执行进去了

haimming

test不是有检查文件的参数吗?
为什么要这么麻烦？

xiaobaibbb

haimming 请直言，在下新手，怕是不能理解您的意思，洗耳恭听哦
在线等

haimming

man test
-d选项

infernor

-a file
file exists

-d file
file exists and is a directory

-e file
file exists; same as -a

-f file
file exists and is a regular file (i.e., not a directory or other special type of file)

-r file
You have read permission on file

-s file
file exists and is not empty

-w file
You have write permission on file

-x file
You have execute permission on file, or directory search permission if it is a directory

-N file
file was modified since it was last read

-O file
You own file

-G file
file's group ID matches yours (or one of yours, if you are in multiple groups)

file1 -nt file2
file1 is newer than file2 [6]

file1 -ot file2
file1 is older than file2

haimming

1. 
   
2. [rockfall@localhost atmp]$ ll
   
3. total 8
   
4. -rw-rw-r-- 1 rockfall rockfall    2 2009-01-15 23:03 a
   
5. drwxrwxr-x 2 rockfall rockfall 4096 2009-01-16 22:56 b
   
6. [rockfall@localhost atmp]$ a=a
   
7. [rockfall@localhost atmp]$ if [ -d $a ] ;then echo y ;else echo n;fi
   
8. n
   
9. [rockfall@localhost atmp]$ a=b
   
10. [rockfall@localhost atmp]$ if [ -d $a ] ;then echo y ;else echo n;fi
    
11. y
    

复制代码

xiaobaibbb

hi haimming
我想问你，如果输入的是1个文件名，比如aaa
但是aaa不是我要的文件，如何判断？
例如命令行里

ls -ahl 文件名|grep '^a'

文件名不匹配，不是以a开头的 那这样执行命令，在新的一行就是空的

todayhero

read input
if [ ! -d $input ]
then
        echo "failed"
fi

if [ ! -e $input ]
then
        echo "abc  command not found"
fi

xiaobaibbb

谢谢楼上的解答，我没看到，谢谢


那我说的那样怎么解决呢？

xiaobaibbb

原帖由 todayhero 于 2009-1-16 23:07 发表
read input
if [ ! -d $input ]
then
        echo "failed"
fi

if [ ! -e $input ]
then
        echo "abc  command not found"
fi

-e FILE
              FILE exists

如果文件存在，echo "abc  command not found"  ？？