Speaking about your earlier code, which you won't need any more but might be interested in anyways:
What you do here is: call /usr/bin/test with the arguments "$num -ge 100" and - if this returns TRUE - call /usr/bin/test again with the arguments "$num -le 199". You can save one open process by calling test once instead of twice because test is able to do logical calculations itself:
You can even manipulate operator precedence by using brackets:
I hope this helps.
bakunin
The test -a and -o binary operators aren't required on all POSIX systems (but are currently required on a UNIX branded systems). With some expressions -a and -o can lead to ambiguities in the grammar; so they are likely to be deprecated in the next revision of the POSIX standards. (That doesn't mean that they'll every actually be removed from the shells, but the shell developers all advise against using them.)
Fortunately, test and [ are built-ins in current shells so you don't actually have to fork and exec /usr/bin/test twice so the penalty for using test twice isn't nearly as high as it was in early shells.
On OS X (which is what wisecracker is using), both bash and ksh support the command:
which is handled as part of the shell's grammar, not as a built-in utility (which makes it even faster and gets rid of the ambiguity in the test syntax). This form isn't in the standards yet, but is also likely to be added in the next revision.
This User Gave Thanks to Don Cragun For This Post:
Just a remark now the board has grown to considerable proportion. I see too little of an active hand(s) maintaning the boards, clipping away dead posts, moving posts that were created in the wrong forums etc. It's a bit tiring to see alot of threads ending in: this has been covered before, do a... (7 Replies)
Hi Admin and Staff...
Thanks for hosting AudioScope.sh on this site. I have had the biggest surprise of my life today.
This months issue of the UK Linux magazine "Linux Format" have done a small piece on the project.
Issue April 2014, LXF 182, page 65...
This I never expected and I... (1 Reply)
Hi all...
Has _below_ ever been done in UNIX shell scripting before?
(I have done this easily in Python but this is using purely the shell.)
The DEMO version IS built and has been tested.
Pre-amble...
I now need at least one control pulse for the AudioScope.sh when in PURELY audio I/O mode,... (2 Replies)
Development machine:- Standard MBP 13 inch, OSX 10.7.5...
GNU bash, version 3.2.48(1)-release (x86_64-apple-darwin11)
Copyright (C) 2007 Free Software Foundation, Inc.
Scenario:- Audio capture for AudioScope.sh for CygWin without ANY third party installs.
I am trying my hardest to get a... (6 Replies)
Can please somebody tell me what could be the reason for the following error (Unix Motorola Server):
/usr/etc/ce3/s374: Board at address 0xff10000 not present - Entry skipped.
/dev/lpc2: I/O error
I already replaced the board 374 on the server, but I have the same problem.
Thank you! (1 Reply)
Boy oh boy, with only a MONO mic input to use AudioScope gets much more difficult when the ALTDC board is included.
It needs, so far, two hits at the MIC input with a single hit at the HEADPHONE audio output.
The first at the highest practical resolution for the AC component and the second... (0 Replies)
Hi all...
Apologies for any typos...
For those intersted in the AudioScope the next construction is finished.
I have not been totally idle but working out the hard stuff to be able to be very simple to build.
It is a single transistor simple timer that lasts for about 1.2 to 1.8 seconds.... (2 Replies)
Using AudioScope.sh on Ubuntu 17.04 from a live DVD disc I came across an error.
Consider the code below it is a MUCH shortened version of the KEYBOARD input in AudioScope.
#!/bin/bash
bash --version
uname -a
status=0
KEYBOARD()
{
read -r -p "Enter QUIT or EXIT to quit:- " kbinput
if ||... (11 Replies)
AudioScope Project.
(Apologies for any typos.)
For the few following......
AudioScope.sh...
Now at Version 0.60.00.
Well this baby has come a long way since its inception in January 2013. It is now at Version 0.60.00. It is MUCH more Apple centric now with a new OSX Sierra minimum _silent_... (7 Replies)