Shell Scripting 面试题与答案
问题 21. Explain the use of the `tee` command in shell scripting.
The `tee` command is used to redirect output to multiple files and the standard output.
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问题 22. What is a here document in shell scripting?
A here document is a way to redirect input into a command or a file using <<.
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问题 23. How do you check if a variable is set in a shell script?
You can use the `isset` or `[ -z $var ]` syntax to check if a variable is set.
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问题 24. Explain the use of the `dirname` command in shell scripting.
The `dirname` command is used to extract the directory component of a pathname.
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问题 25. What is the purpose of the `getopts` command in shell scripting?
The `getopts` command is used to parse command-line options in shell scripts.
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