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Encontrar comando em Linux


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MAN which:

It does this by searching the PATH for executable files matching the names of the arguments

Para obteres a variável de ambiente PATH só precisas de fazer:

char * path;
path = getenv("PATH");

Vais obter um string do tipo ":/bin:/etc:/usr/bin:/usr/new/X11:/usr/new:/usr/local/bin". Depois só tens que separar a string pelos ":" (*) e depois procurares o ficheiro binário nessas pastas (**)

*podes usar a função strtok, mas não te esqueças que ela altera a string, portanto tens que copiá-la (strncpy) primeiro.

**podes usar a função stat() para ver se o ficheiro existe:

if(stat("/usr/bin/hello",&st) == 0) printf("o ficheiro existe!");

❝The idea that I can be presented with a problem, set out to logically solve it with the tools at hand, and wind up with a program that could not be legally used because someone else followed the same logical steps some years ago and filed for a patent on it is horrifying.❞- John Carmack on software patents

A list  of command line apps

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