new utilities.
the .C files compile but are renamed to avoid building automatically.
diff --git a/src/cmd/seq.c b/src/cmd/seq.c
new file mode 100644
index 0000000..062bb8a
--- /dev/null
+++ b/src/cmd/seq.c
@@ -0,0 +1,92 @@
+#include <u.h>
+#include <libc.h>
+
+double min = 1.0;
+double max = 0.0;
+double incr = 1.0;
+int constant = 0;
+int nsteps;
+char *format;
+
+void
+usage(void)
+{
+ fprint(2, "usage: seq [-fformat] [-w] [first [incr]] last\n");
+ exits("usage");
+}
+
+void
+buildfmt(void)
+{
+ int i;
+ char *dp;
+ int w, p, maxw, maxp;
+ static char fmt[16];
+ char buf[32];
+
+ format = "%g\n";
+ if(!constant)
+ return;
+ maxw = 0;
+ maxp = 0;
+ for(i=0; i<=nsteps; i++){
+ sprint(buf, "%g", min+i*incr);
+ if(strchr(buf, 'e')!=0)
+ return;
+ dp = strchr(buf,'.');
+ w = dp==0? strlen(buf): dp-buf;
+ p = dp==0? 0: strlen(strchr(buf,'.')+1);
+ if(w>maxw)
+ maxw = w;
+ if(p>maxp)
+ maxp = p;
+ }
+ if(maxp > 0)
+ maxw += maxp+1;
+ sprint(fmt,"%%%d.%df\n", maxw, maxp);
+ format = fmt;
+}
+
+void
+main(int argc, char *argv[]){
+ int i, j, n;
+ char buf[256], ffmt[4096];
+
+ ARGBEGIN{
+ case 'w':
+ constant++;
+ break;
+ case 'f':
+ format = ARGF();
+ if(format[strlen(format)-1] != '\n'){
+ sprint(ffmt, "%s\n", format);
+ format = ffmt;
+ }
+ break;
+ default:
+ goto out;
+ }ARGEND
+ out:
+ if(argc<1 || argc>3)
+ usage();
+ max = atof(argv[argc-1]);
+ if(argc > 1)
+ min = atof(argv[0]);
+ if(argc > 2)
+ incr = atof(argv[1]);
+ if(incr == 0){
+ fprint(2, "seq: zero increment\n");
+ exits("zero increment");
+ }
+ nsteps = (max-min)/incr+.5;
+ if(!format)
+ buildfmt();
+ for(i=0; i<=nsteps; i++){
+ n = sprint(buf, format, min+i*incr);
+ if(constant)
+ for(j=0; buf[j]==' '; j++)
+ buf[j] ='0';
+ write(1, buf, n);
+ }
+ exits(0);
+}
