shell命令wc,md5sum,basename

2、wc [-lwm]

选项与参数：

-l ：仅列出行；

-w ：仅列出多少字(英文单字)；

-m ：多少字符；

3、md5sum

md5sum [OPTION]... [FILE]...

Print or check MD5 (128-bit) checksums.

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

-b, --binary read in binary mode

-c, --check read MD5 sums from the FILEs and check them

-t, --text read in text mode (default)

1)示例

md5sum prime.cpp

md5sum prime.cpp > md5_file

md5sum *.cpp > md5_file

验证：

md5sum -c md5_file

7、basename,dirname

1)Usage: basename NAME [SUFFIX]

or: basename OPTION

Examples:

basename /usr/bin/sort Output "sort".

basename include/stdio.h .h Output "stdio".

2)Usage: dirname NAME

or: dirname OPTION

Examples:

dirname /usr/bin/ Output "/usr".

dirname stdio.h Output ".".