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2025-09-23 Update From: SLTechnology News&Howtos shulou NAV: SLTechnology News&Howtos > Servers >
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Input and output redirection: write to a file what was originally output to the screen. This operation is called output redirection.
Pipeline command: the information that the previous command was supposed to output to the screen is given to the later command for secondary processing.
Wildcard characters on the command line
An asterisk (*) can match a null value or infinity
Say hello (? ) one character. (there must be something to match.)
[amurz] matches a single lowercase letter
[Amurz] matches a single capital letter
[0-9] matches a single number
[1BZ 3P5] matches the specified number
[aMagnec _ e] matches the specified lowercase letter
[AmenthCpence E] matches the specified uppercase letters
Commonly used escape characters
The four most commonly used escape characters are shown below.
Backslash (\): changes a variable after a backslash to a simple string.
Single quotation mark (''): escapes all variables as simple strings.
Double quotation marks (""): the variable attributes are retained without escape processing.
Back quotation mark (``): returns the result after the command is executed.
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