Ahmed El-Gamal Ahmed El-Gamal - 4 months ago 45
C Question

How to get Linux command location in C?

I am using

execv
in C, but it demands to get the path of the command to get it executed, For example:


  • To execute
    ls
    I must have
    char* command = "/bin/ls";

  • To execute
    gedit
    I must have char*
    command = "/usr/bin/gedit";



My question is how to get the string
"/bin"
or
"/usr/bin"
in C ?

Answer

You can get the PATH variable from the environment. Then you parse it to get each component, then check in the location of each component whether the given command (file) exists there.

This is basically what the which command does. Source code of linux utilities can be found on-line