grep means comprehensive search for regular expressions. It is a powerful text search tool for filtering and searching for specific characters, and it is also the most widely used command.
Syntax format: grep [parameter]
Common parameters:
Example
# 在文件中搜索字符串grep "putText" motion_detector.py # 在多个文件中搜索grep "putText" test1.py test2.py test3.py
# 输出除了字符串外的其它内容grep -v "putText" test.py # 统计字符串出现的行数总数grep -c "putText" test.py # 结合其它命令使用history | grep man
# 在当前目录下递归搜索包含字符串text的文件，结果中显示出现的行数grep "text" . -r -n # 使用正则表达式进行搜索grep -P "[az]+\." motion_detector.py
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