awk and symbolic link

Symbolic links refer to:

    A symbolic path indicating the abstract location of another file.

Hard links refer to:

    The specific location of physical data.

Hard links can only refer to data that exists on the same file system.

a hard link is a reference, or pointer, to physical data on a storage volume.

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http://blog.csdn.net/richardysteven/article/details/7381452

2. 运行

awk 'program' input-file1 input-file2 ...

or

awk -f program-file input-file1 input-file2 ...


3. program的格式

program = pattern {action}

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http://www.hcs.harvard.edu/~dholland/computers/awk.html