[开发工具]Macbook M1 自己编译realpath命令

由于mac系统不自带realpath命令，调用出错

zsh: command not found: realpath

网上说要brew install coreutils，但好像没有m1的源

jesse@JessedeMacBook-Air ~ % brew install coreutils
==> Searching for similarly named formulae...
Error: No similarly named formulae found.
Error: No available formula or cask with the name "coreutils".
==> Searching for a previously deleted formula (in the last month)...
Error: No previously deleted formula found.
==> Searching taps on GitHub...
Error: No formulae found in taps.

所以打算自己编一个realpath

realpath.c源文件

#include <stdio.h>
#include <errno.h>
#include <stdlib.h>
#include <string.h>

/*
gcc -MD -o realpath realpath.c
*/
int main(int argc, char *argv[]) {
    if(argc < 2) {
        printf("usage: $0 path [path...]\n");
        return 1;
    }

    int i;
    char *rpath;
    for(i=1; i<argc; i++) {
        rpath = realpath(argv[i], NULL);
        if(rpath) {
            printf("%s\n", rpath);
            free(rpath);
        } else {
            fprintf(stderr, "realpath %s error: %d, %s\n", argv[i], errno, strerror(errno));
        }
    }
    return 0;
}

运行gcc编译命令，生成realpath可执行文件

jesse@JessedeMacBook-Air realpath % gcc -MD -o realpath realpath.c
jesse@JessedeMacBook-Air realpath % ls
realpath   realpath.c realpath.d

把可执行文件复制到path路径内即可

由于mac系统的bin，sbin目录不可以修改，我是在用户目录下建立个bin目录存放一下自己的命令

mkdir ~/bin
cp realpath ~/bin

修改vim ~/.bash_profile把bin目录加入path中，如下

# 用户bin
export USERBIN=/Users/jesse/bin
export PATH=$PATH:$USERBIN

最后执行一下source ~/.bash_profile就可以愉快的使用realpath了

jesse@JessedeMacBook-Air realpath % source ~/.bash_profile 
jesse@JessedeMacBook-Air realpath % realpath
/tmp/realpath/