From $2.2
1, One problem with using matching quotes as we did in the previous examples is that<?xml:namespace prefix = o ns = "urn:schemas-microsoft-com:office:office" />
you have to remember to start the token with an opening quote. This raises an issue
when you want to quote a single character. You can use the backquote ( ` ) character
to do this (the backquote is usually the upper leftmost key, below escape):
PS (6) > cd c:/program` files
PS (7) > pwd
Path
----
C:/Program Files
2, what’s the difference between simple and double quotes?
In double quotes, variables are expanded. In other words, if the string contains a variable
reference starting with a “$”, it will be replaced by the string representation of the
value stored in the variable. Let’s look at an example of this. First assign the string
"files" to the variable $v:
PS (10) > $v = "files"
Now let’s reference that variable in a string with double quotes:
PS (11) > cd "c:/program $v"
PS (12) > pwd
Path
----
C:/Program Files
3, lists the special characters that can be generated using backtick (also called
escape) sequences.
Table 2.1 Backtick escape sequences
Escape Sequence Corresponding Special Character
`n Newline
`r Carriage return
`t Horizontal tab
`a Alert
`b Backspace
`' Single quote
`" Double quote
`0 Null
`` A single backtick