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Full Discussion: ksh in vi mode, choose from output
Top Forums UNIX for Dummies Questions & Answers ksh in vi mode, choose from output Post 302070876 by Perderabo on Sunday 9th of April 2006 01:43:18 PM
Old 04-09-2006
Any numbered list will look like a select menu. There is no direct way to do anything with the list. (Cut and paste using x or windows doesn't count...the question is looking for functionality built into ksh itself.) There is a sequence of operations that can exploit that list somewhat. The only time I ever use it is just to show that it is possible. Most of the time you would be better off just typing "testb" or whatever. I usually work in emacs mode. But it looks like vi mode can do it too.

root# ls
testa testb

root# cat tes[ESC][=]
1) testa
2) testb
root# cat tes <-- what to do now?

Type * to replace "tes" with "testa testb" on the command line.

root# cat testa testb

Type [Esc][#] to turn the current line into a comment and drop it in your history file.

Now you retype your command but now you can extract words from the previous (commented) command in you history. Item n in the list you displayed is word n+1. So for example, "testb" is item 2 in the list and thus word 3 in the previous list. To extract word 3...

cat[Esc]3_

root# cat testb

Note that we did not need a space after the t in "cat". In this case, it so happens that we want the last word of the previous command. So we actually could have omitted the 3. The default is the last word. With enough complex filenames this technique could, in theory, be useful. I know, this isn't what you were looking for. But it is the the closest I can come to exploiting that numbered list of filenames.
 

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LEARN ABOUT XFREE86

testb

testb(9F)						   Kernel Functions for Drivers 						 testb(9F)

NAME

       testb - check for an available buffer

SYNOPSIS

       #include <sys/stream.h>

       int testb(size_t size, uint_t pri);

INTERFACE LEVEL

       Architecture independent level 1 (DDI/DKI).

PARAMETERS

       size	Size of the requested buffer.

       pri	Priority of the allocb request.

DESCRIPTION

       testb()	checks	to  see  if  an   allocb(9F)  call  is likely to succeed if a buffer of  size bytes at priority  pri is requested. Even if
       testb() returns successfully, the call to  allocb(9F) can fail. The pri argument is no longer used, but is retained for	compatibility.

RETURN VALUES

       Returns	1 if a buffer of the  requested size is available, and	0 if one is not.

CONTEXT

       testb() can be called from user or interrupt context.

EXAMPLES

       Example 1: testb() example

       In a service routine, if  copymsg(9F) fails (line 6), the message is put back on the queue (line 7) and a routine,  tryagain, is  scheduled
       to be run in one tenth of a second. Then the service routine returns.

       When  the  timeout(9F) function runs, if there is no message on the front of the queue, it just returns.  Otherwise, for each message block
       in the first message, check to see if an allocation would succeed.  If the number of message blocks equals the number we can allocate, then
       enable  the service procedure. Otherwise, reschedule  tryagain to run again in another tenth of a second.  Note that  tryagain is merely an
       approximation. Its accounting may be faulty.  Consider the case of a message comprised of two 1024-byte message blocks.	If there  is  only
       one  free  1024-byte  message block and no free 2048-byte message blocks, then  testb() will still succeed twice.  If no message blocks are
       freed of these sizes before the service procedure runs again, then the  copymsg(9F) will still fail. The reason	testb() is  used  here	is
       because it is significantly faster than calling	copymsg. We must minimize the amount of time spent in a  timeout() routine.

	1  xxxsrv(q)
	2      queue_t *q;
	3  {
	4   mblk_t *mp;
	5   mblk_t *nmp;
	       . . .
	6   if ((nmp = copymsg(mp)) == NULL) {
	7	 putbq(q, mp);
	8	 timeout(tryagain, (intptr_t)q, drv_usectohz(100000));
	9	 return;
       10   }
	    . . .
       11  }
       12
       13  tryagain(q)
       14      queue_t *q;
       15  {
       16   register int can_alloc = 0;
       17   register int num_blks = 0;
       18   register mblk_t *mp;
       19
       20   if (!q->q_first)
       21	 return;
       22   for (mp = q->q_first; mp; mp = mp->b_cont) {
       23	 num_blks++;
       24	 can_alloc += testb((mp->b_datap->db_lim -
       25	     mp->b_datap->db_base), BPRI_MED);
       26   }
       27   if (num_blks == can_alloc)
       28	 qenable(q);
       29   else
       30	 timeout(tryagain, (intptr_t)q, drv_usectohz(100000));
       31  }

SEE ALSO

       allocb(9F), bufcall(9F), copymsg(9F), timeout(9F)

       Writing Device Drivers

       STREAMS Programming Guide

NOTES

       The pri argument is provided for compatibility only. Its value is ignored.

SunOS 5.10							    11 Nov 1996 							 testb(9F)
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