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#include <err.h>
#include <stdio.h>
#include <unistd.h>
int
main(int argc, char *argv[])
{
char *a, ans[10], file[30];
FILE *fp;
int i;
if(argc-1 == 0){
fprintf(stderr, "usage: %s file [...]\n", argv[0]);
return 1;
}
/* Ensure arguments do not contain newlines. */
for(i = 1; i < argc; i++)
for(a = argv[i]; *a; a++)
if(*a == '\n'){
*a = '*';
fprintf(stderr,
"%s contains newline(at *)\n",
argv[i]);
return 1;
}
sprintf(file, "/var/tmp/re.%d", getppid());
if(!access(file, F_OK)){
do
fprintf(stderr, "%s already exists; overwrite? ", file);
while(!gets(ans) || !*ans);
if(ans[0] != 'y') return 1;
}
if(!(fp = fopen(file, "w")))
err(1, "fopen");
for(i = 1; i < argc; i++){
fprintf(fp, "%s\n", argv[i]);
printf("%s\n", argv[i]);
}
fclose(fp);
}
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