又一周一练，请大家来交流一下

shaoping

Write a single command to accomplish the following goals:


1.Remove all files with file names longer than five characters

2.Find all files that end in the extension “.cpp” and create a of each, in the same directory, with the same name appended with “.backup”.  For example, if you find “~/code/helloWorld.cpp” you should create “~/code/helloWorld.cpp.backup”

3.Make a complete copy of your home directory (and all subdirectories inside, recursively) into the /temp directory.




Write Regular Expressions that match strings of the following criteria:


1. Any string that begins with an ‘a’, ends with an ‘a’, and contains anything except ‘a’s in-between.

2. Any string that contains three digits, next to each other, or not next to each other.

3. Any string that begins with a vowel (a, e, i, o, or u, never mind y), capital or lowercase.

KornLee

1,rm ?????*
2,for file $(ls *.cpp);do mv $file $file.backup;done
3,cp -dpR /home /temp
1,^a[b-z]*a$
2,[0-9]\{3\}
3,?

shaoping

谢谢.

^[aeiouyAEIOUY]  这样可以吗?
^ 代表开头的, aeiouy 的大小写都在[ ] 里了^_^

KornLee

never mind y
这是什么意思?

dsxl

觉得这个不太对：
1,^a[b-z]*a$
因为当中的字符不一定都是小写字母
我觉得类似于这个
\<a[^a]*a\>
明天找机器试一下,呵呵

shaoping

最初由 javalee 发表
never mind y
这是什么意思?

v.
没关系, 不用担心.

我是想，y 是付合条件的.

shaoping

1.  rm ?????*
2.  find ~ -name \*.cpp|sed -e s/cpp/cpp\.back/|xargs touch
3,  cp -dpR /home /temp

1,  ^a[b-z]*a$
2,  [0-9]{3}
3,  ^[aeiouyAEIOUY].*

不知这样做对不对.

大坏羊

1.还可以　 ls | grep ".\{5,\}" | xarg rm -f

willczrw

Thank you for sharing