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pgrep: Add -c option to show the number of matches

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Tim Ledbetter 2023-05-30 17:51:18 +01:00 committed by Andreas Kling
parent f95e6ee849
commit ad851706ab
Notes: sideshowbarker 2024-07-17 06:38:11 +09:00 
Author: https://github.com/tcl3
Commit: https://github.com/SerenityOS/serenity/commit/ad851706ab
Pull-request: https://github.com/SerenityOS/serenity/pull/19155
2 changed files with 18 additions and 12 deletions
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3
Base/usr/share/man/man1/pgrep.md
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@ -5,11 +5,12 @@ pgrep - look up processes based on name
## Synopsis
```sh
$ pgrep [-d delimiter] [--ignore-case] [--invert-match] <process-name>
$ pgrep [--count] [-d delimiter] [--ignore-case] [--invert-match] <process-name>
```
## Options
* `-c`, `--count`: Suppress normal output and print the number of matching processes
* `-d`, `--delimiter`: Set the string used to delimit multiple pids
* `-i`, `--ignore-case`: Make matches case-insensitive
* `-v`, `--invert-match`: Select non-matching lines

27
Userland/Utilities/pgrep.cpp
View file

@ -20,12 +20,14 @@ ErrorOr<int> serenity_main(Main::Arguments args)
TRY(Core::System::unveil("/etc/passwd", "r"));
TRY(Core::System::unveil(nullptr, nullptr));
bool display_number_of_matches = false;
auto pid_delimiter = "\n"sv;
bool case_insensitive = false;
bool invert_match = false;
StringView pattern;
Core::ArgsParser args_parser;
args_parser.add_option(display_number_of_matches, "Suppress normal output and print the number of matching processes", "count", 'c');
args_parser.add_option(pid_delimiter, "Set the string used to delimit multiple pids", "delimiter", 'd', nullptr);
args_parser.add_option(case_insensitive, "Make matches case-insensitive", "ignore-case", 'i');
args_parser.add_option(invert_match, "Select non-matching lines", "invert-match", 'v');
@ -51,20 +53,23 @@ ErrorOr<int> serenity_main(Main::Arguments args)
}
}
quick_sort(matches);
if (display_number_of_matches) {
outln("{}", matches.size());
} else {
quick_sort(matches);
auto displayed_at_least_one = false;
for (auto& match : matches) {
if (displayed_at_least_one)
out("{}{}"sv, pid_delimiter, match);
else
out("{}"sv, match);
displayed_at_least_one = true;
}
auto displayed_at_least_one = false;
for (auto& match : matches) {
if (displayed_at_least_one)
out("{}{}"sv, pid_delimiter, match);
else
out("{}"sv, match);
displayed_at_least_one = true;
outln();
}
if (displayed_at_least_one)
outln();
return matches.size() > 0 ? 0 : 1;
}