First, GREP
1. Run: Search for specific content in the specified file and output the line standard of these content.
2, format
Grep [options]
3, main parameters
[Options] Main parameters:
-C: Only the count of matched rows is output.
-I: Not case sensitive (only for single characters)
-H: The file name is not displayed when querying multi-files.
-L: You only output file names that contain match characters when querying multi-files.
-N: Display matching row and line number.
-S: Do not display error messages that do not exist or have no text.
-V: Displays all rows that do not contain matching text.
Pattern regular expression main parameters:
: Ignore the original meaning of special characters in regular expressions.
^: Match the start of the regular expression.
$: Match the end line of the regular expression.
<: From the row of matching regular expressions.
>: The line ends to match the regular expression.
[]: Single character, such as [a], is a conformity.
[-]: Range, such as [A-Z], that is, A, B, and C, until Z is compliant.
: All single characters.
*: There is a character, the length can be 0.
Two .tar
Role: Package files and unpack files. Package format: TAR ZXCF {target} .tgz source unpacking format: Tar Zxvf file.tgz
