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Index > Linux > call shell command

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belhifet



Joined: 03 Oct 2006
Posts: 2
belhifet
How do I call a bash built-in command?
"echo" for example.

I need the equivalent of C's system("echo hello");
Post 22 Nov 2006, 21:43
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lsa



Joined: 10 Aug 2006
Posts: 17
Location: Denmark
lsa
You can use the syscall 'execve' to execute another program from within yours (it takes over your program).
The 'system' word in C does (as far as i can remember) also fork a new process to allow the calling program to continue, so the procedure is as follows:
##
Fork
And then from Child: execve ("/bin/echo",0,0)
##
See: man 2 execve, man 2 fork for usage.

Sorry, don`t have time to find/write the exact code for you at this momemt.
Post 30 Nov 2006, 19:21
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