AGRISCS@umcvmb.missouri.edu (Don Ingli) (12/26/89)
Standard unix utilities(programs) probably work a whole lot better then
some of the stuff that I can write to do the same thing. I developed the
following program so that you can 'link' c with the unix shell...
#include <stdio.h>
#include <signal.h>
main(argc,argv)
int argc; char *argv[];
{
/* this program shows how to link unix commands with C */
FILE *fp, *popoen();
char buf[BUFSIZ];
/* place any unix command(s) where ls -l is like you would have
typed them in in shell... */
/* try replacing ls -l with du -ra | awk '{print $2}' */
if((fp=popen("ls -l","r"))==NULL) {
/* REMEMBER the string ls -l could have been replaced with a char varible
as well.... */
fprintf(stderr,"%s: bad popen\n",argv[0]);
exit(1);
}
while(fgets(buf,sizeof buf,fp)!=NULL) {
/* the char varible buf now contains the first line of output from
your unix command... */
printf("%s",buf);
/* no \n used because fgets keeps the \n in the string buf */
}
}
Hope this helps you all...
DON INGLI------------------------------------------------------------+
UNITED STATES DEPARTMENT OF AGRICULTURE - SOIL CONSERVATION SERVICE |
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ALL OPINIONS IN THIS NOTE ARE OF MY OWN AND DO NOT REPRESENT THE |
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