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Userland: Add 'which' command (#497)

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This mimics the shell's path resolution to locate the executable that
would execute if typing it as a command.
This commit is contained in:
Brandon Scott 2019-08-28 23:23:23 -05:00 committed by Andreas Kling
parent 50ef2216fa
commit 23e8715022
Notes: sideshowbarker 2024-07-19 12:28:51 +09:00 
Author: https://github.com/xeons 🔰
Commit: https://github.com/SerenityOS/serenity/commit/23e8715022d
Pull-request: https://github.com/SerenityOS/serenity/pull/497
Reviewed-by: https://github.com/awesomekling
1 changed files with 29 additions and 0 deletions
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Userland/which.cpp Normal file
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#include <AK/AKString.h>
#include <AK/Vector.h>
#include <stdio.h>
#include <unistd.h>
int main(int argc, char** argv)
{
if (argc < 2) {
printf("usage: which <executable>\n");
return 0;
}
char* filename = argv[1];
String path = getenv("PATH");
if (path.is_empty())
path = "/bin:/usr/bin";
auto parts = path.split(':');
for (auto& part : parts) {
auto candidate = String::format("%s/%s", part.characters(), filename);
if(access(candidate.characters(), X_OK) == 0) {
printf("%s\n", candidate.characters());
return 0;
}
}
return 1;
}