Linux grep command is used to find strings that meet the conditions in the file.
The grep command is used to find files whose content contains the specified template style. If the content of a file is found to match the specified template style, the default grep command will display the column containing the template style. If no file name is specified, or if the file name is - -, the grep command reads data from the standard input device.
Syntax:
grep
Parameters:
-a or --text: Do not ignore binary data.
-A
-b or --byte-offset: Before displaying the line that matches the style, mark the number of the first character of the line.
-B
-c or --count : Count the number of columns that match the style.
-C
-d
-e or --regexp= : Specify a string as the style for searching file content.
-E or --extended-regexp : Use extended regular expression style.
-f
-F or --fixed-regexp : Treat styles as a list of fixed strings.
-G or --basic-regexp : Use the style as a normal representation.
-h or --no-filename : Do not indicate the file name to which the line belongs before displaying the line that matches the style.
-H or --with-filename : Before displaying the line that matches the style, indicates the file name to which the line belongs.
-i or --ignore-case : Ignore differences in character case.
-l or --file-with-matches : List the file names whose file contents match the specified pattern.
-L or --files-without-match : List the file names whose file contents do not match the specified style.
-n or --line-number: Before displaying the line that matches the style, indicate the column number of the line.
-o or --only-matching: Only display the matching PATTERN part.
-q or --quiet or --silent : Do not display any information.
-r or --recursive: The effect of this parameter is the same as specifying the "-d recurse" parameter.
-s or --no-messages : Do not display error messages.
-v or --invert-match : Display all lines that do not contain matching text.
-V or --version : Display version information.
-w or --word-regexp: Only display columns that match the full word.
-x --line-regexp : Only display columns that match all columns.
-y: The effect of this parameter is the same as specifying the "-i" parameter.
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