grep sed awk

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Knowledge Point Grooming: Click the link to enter1. Shell Introduction and variables, scripting related concepts2. Bash Programming: Condition testing3. Bash Programming: arithmetic operations4. Bash Programming: If statements5. Bash Programming: Case statements, read and user interaction6. Bash Programming: Process Control7. Bash Programming: functions and Arrays8. sed command--stream editor9. awk Command-

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The-a-b-options for grep are detailedgrep can find the line with the keyword, but the work sometimes needs to find the line before and after the line, the following is explained1. GREP-A1 keyword filenameFind the row with keyword in filename, in addition to the line displayed in the output, the following line is displayed (after 1)2. GREP-B1 keyword filenameFind