Linux Gvim Shell String

#字符串: As the number is the most commonly used type, the other is nothing to use.
#字符串可以使用单引号, double quotes, without quotes.
#单引号字符串限制:
# 1. Any character is output as is, and the variable in single quotation marks is invalid
# 2. Single quotes cannot appear in single-quote strings, nor can I use escape characters
# str= ' This is a string '
#双引号优点:
# 1. can have variables
# 2. Escape characters can appear

1 your_name='matto'2 str="  Hello, I know you is \" ${your_ name} \ "! \ n"3echo""

#拼接字符串

1 name="matto"2echo""3 greeting="Hello, \" ${name} \ "! \ n"4 greeting_1="  Hello, ${name}! " 5 Echo " "

#获取字符串长度

1 str="matto"2echo ${#str}

#获取字符串的一部分. The first digit of the string is the 0,1:4, or 2–5 character.

1 str="thisis a str"2echo ${str:1:4 }    

#查找子字符串

1 str="Alibaba is a great company"2echo 'expr" "is"  

Linux Gvim Shell String