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pgrep: Add -o option to display the oldest matching process only

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Tim Ledbetter 2023-06-09 17:40:16 +01:00 • committed by Andreas Kling
parent 47b530fa71
commit d03aaddb55
2 changed files with 12 additions and 1 deletions
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10
Userland/Utilities/pgrep.cpp
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@ -29,6 +29,7 @@ ErrorOr<int> serenity_main(Main::Arguments args)
bool invert_match = false;
bool exact_match = false;
bool newest_only = false;
bool oldest_only = false;
HashTable<uid_t> uids_to_filter_by;
StringView pattern;
@ -37,6 +38,7 @@ ErrorOr<int> serenity_main(Main::Arguments args)
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(newest_only, "Select the most recently created process only", "newest", 'n');
args_parser.add_option(oldest_only, "Select the least recently created process only", "oldest", 'o');
args_parser.add_option(list_process_name, "List the process name in addition to its pid", "list-name", 'l');
args_parser.add_option(Core::ArgsParser::Option {
.argument_mode = Core::ArgsParser::OptionArgumentMode::Required,
@ -67,6 +69,12 @@ ErrorOr<int> serenity_main(Main::Arguments args)
args_parser.add_positional_argument(pattern, "Process name to search for", "process-name");
args_parser.parse(args);
if (newest_only && oldest_only) {
warnln("The -n and -o options are mutually exclusive");
args_parser.print_usage(stderr, args.strings[0]);
return 1;
}
PosixOptions options {};
if (case_insensitive)
options |= PosixFlags::Insensitive;
@ -101,6 +109,8 @@ ErrorOr<int> serenity_main(Main::Arguments args)
quick_sort(matches, [](auto const& a, auto const& b) { return a.creation_time < b.creation_time; });
if (newest_only)
matches = { matches.last() };
else if (oldest_only)
matches = { matches.first() };
auto displayed_at_least_one = false;
for (auto& match : matches) {