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What does it mean to use line buffer in grep?
In your command, grep ‘s output is piped to stdin of sed command, so grep buffer its output. So, –line-buffered option causing grep using line buffer, meaning writing output each time it saw a newline, instead of waiting to reach 4096 bytes by default. But in this case, you don’t need grep at all, just use tail + sed:
When to ignore grep.patterntype option in Git?
This option is ignored when the grep.patternType option is set to a value other than default. Number of grep worker threads to use. If unset (or set to 0), Git will use as many threads as the number of logical cores available. If set to true, enable –full-name option by default.
Is the output of Git grep compatible with git diff?
For better compatibility with git diff, –name-only is a synonym for –files-with-matches. Open the matching files in the pager (not the output of grep ).
What’s the default number of threads for Git grep?
Number of grep worker threads to use. If unset (or set to 0), Git will use as many threads as the number of logical cores available. If set to true, enable –full-name option by default. If set to true, fall back to git grep –no-index if git grep is executed outside of a git repository. Defaults to false.
What does grep only the first match mean?
-m 1 means return the first match in any given file. But it will still continue to search in other files. Also, if there are two or more matched in the same line, all of them will be displayed. You can pipe grep result to head in conjunction with stdbuf.
When to use stdbuf to stop grep after nth match?
Note, that in order to ensure stopping after Nth match, you need to using stdbuf to make sure grep don’t buffer its output: As soon as head consumes 1 line, it terminated and grep will receive SIGPIPE because it still output something to pipe while head was gone. This assumed that no file names contain newline.
When does grep exit after the first line?
head will exit as soon as it encounters the first line. grep will exit the next time it tries to write after head has exited. Some shells will wait until all elements of a pipeline finish, some will cause the entire pipe to shutdown as soon as the last program in the pipe exits.