Single quotes and double quotes in shell

1. http://edsionte.com/techblog/archives/3712 echo and backslash

Group records:

2. This is only a variable. Double quotation marks will prevent shell tokens from echo "a B" and echo a B.
3 --------
4 "a B" is a parameter of echo, while echo a B is two parameters of echo?
5
6
7. What is echo-e "\ tz" explained by shell? Or "\ tz? Then pass "\ tz" to echo?
8 ---------
9 do I understand this ~?
10 I'm SUN crazy. cc <walkerxk@gmail.com> 11:51:31
11 "\ tz" is interpreted as \ tz by shell, and the echo obtained is \ tz.
12 11:45:03 # tp # ~> Echo '"\ tz "'
13 "\ tz"
14 11:51:42 # tp # ~>
15 here echo gets "\ tz"

2. $ @ $ * difference (man special paraments)

Http://blog.sina.com.cn/s/blog_62c5db6e0100hpp8.html

Http://m.oschina.net/blog/35905

Reference code:

2 #! /Usr/bin/env bash
3 echo $ #
4 echo "******"
5 for I in $ *; do echo $ I; done
6 echo "--------"
7 for I in $ @; do echo $ I; done
8 echo "--------"
9 for I in "$ *"; do echo $ I; done
10 echo "--------"
11 for I in "$ @"; do echo $ I; done
12 echo "@@@@@@@@"
13 for I in "a" "bc"; do echo $ I; done
14 exit
15
16 echo $ *
17 echo $ @
18 echo "$ *"
19 echo "$ @"
20
21
22
23 until [-z "$ *"];
24 do
25 echo "$ @"
26 shift
27 done

 

3. About test

Http://17610376.blog.51cto.com/366886/405691

Http://blog.csdn.net/ottocho/article/details/7248041

Http://my.oschina.net/aiguozhe/blog/35937 test [[[differences

Http://www.ibm.com/developerworks/cn/linux/l-bash-test.html ibm: bash testing and comparison functions

Http://hi.baidu.com/richardma_/blog/item/1e3672d6a87d5f0aa18bb7d1.html
 

4. eval shift

Http://www.uplinux.com/shizi/wenxian/3778.html

Http://hi.baidu.com/shenqb/blog/item/613835dd53d6d6d38d1029d9.html/cmtid/367ab064975ffbfff73654d3

5. Double quotation marks

Http://hi.baidu.com/all_around_all/blog/item/13ef6431993f84db9d3d6264.html
 
Http://www.51testing.com /? Uid-47329-action-viewspace-itemid-86711

 
Http://hi.baidu.com/outsmile/blog/item/4f0102c4b5bcbcc139db4985.html

 
Http://www.igigo.net/archives/128 Bash quotes (this blog is awesome)

 

6. About Cat

Http://www.cnblogs.com/xlmeng1988/archive/2012/03/31/cat.html
 

7. IFS

Http://www.haogongju.net/art/591905
 
Recommended http://pkuwwt.blogspot.jp/2010/06/bashifs.html

 

8. Use and principles of screen

Http://doc.chinaunix.net/linux/200904/239872.shtml

 

9. ibm: bash parameter and parameter Extension

Http://www.ibm.com/developerworks/cn/linux/l-bash-parameters.html

Http://www.heartdemon.com/post/87.html

Http://www.cnblogs.com/pengxl/archive/2010/11/30/1887790.html

Http://www.51testing.com /? Uid-61754-action-viewspace-itemid-96942

Http://hi.baidu.com/msingle/blog/item/8fa2b113557b1b2ddd540134.html bash reserved characters

Http://www.chinaunix.net/jh/24/503842.html

10. shell random string

Http://blog.sina.com.cn/s/blog_62c5db6e0100hp61.html

 

11.