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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
Notes: sideshowbarker 2024-07-18 01:43:16 +09:00 
Author: https://github.com/tcl3
Commit: https://github.com/SerenityOS/serenity/commit/d03aaddb55
Pull-request: https://github.com/SerenityOS/serenity/pull/19335
2 changed files with 12 additions and 1 deletions
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3
Base/usr/share/man/man1/pgrep.md
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@ -5,7 +5,7 @@ pgrep - look up processes based on name
## Synopsis
```sh
$ pgrep [--count] [-d delimiter] [--ignore-case] [--list-name] [--newest] [--uid uid-list] [--invert-match] [--exact] <process-name>
$ pgrep [--count] [-d delimiter] [--ignore-case] [--list-name] [--newest] [--oldest] [--uid uid-list] [--invert-match] [--exact] <process-name>
```
## Options
@ -15,6 +15,7 @@ $ pgrep [--count] [-d delimiter] [--ignore-case] [--list-name] [--newest] [--uid
* `-i`, `--ignore-case`: Make matches case-insensitive
* `-l`, `--list-name`: List the process name in addition to its pid
* `-n`, `--newest`: Select the most recently created process only
* `-o`, `--oldest`: Select the least recently created process only
* `-U uid-list`, `--uid uid-list`: Select only processes whose UID is in the given comma-separated list. Login name or numerical user ID may be used
* `-x`, `--exact`: Select only processes whose names match the given pattern exactly
* `-v`, `--invert-match`: Select non-matching lines

10
Userland/Utilities/pgrep.cpp
View file

@ -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) {