powershell - Show the previous and after N lines each for the matched lines?

Question

The following command will show the lines match the pattern.

cat file.txt | select-string -pattern "..."

How to show the previous and after 3 lines each for the matched lines? (Like the -C3 parameter of grep.) Also is it possible to print out the line number?

BTW, the command is much slower comparing with grep?

Answer 1

Specify the filename in the -Path parameter of Select-String, and use the -Context switch to specify the number of lines before and after to include.

select-string -path file.txt -pattern "..." -Context 1,3

The file name and line number will be included in the output