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Top Forums UNIX for Dummies Questions & Answers Need help with repeating variables in a shell script Post 302760721 by Corona688 on Thursday 24th of January 2013 01:17:07 PM
Old 01-24-2013
Quote:
Originally Posted by ricco19
Basically, the program needs to sit in terminal forever waiting for a keystroke. After an initial keystroke, it needs to wait a very short amount of time (1/10th of a second in this case) for another keystroke. If no keystroke is registered in that short time, it echos the output (which will be piped with sed commands), and restarts.
Hmmm.

I think a terminal device can do that all by itself without bash's help, actually! From man termios:

Code:
       In non-canonical mode input is available immediately (without the  user
       having  to  type  a line-delimiter character), and line editing is dis-
       abled.  The settings of MIN (c_cc[VMIN]) and TIME (c_cc[VTIME])  deter-
       mine  the  circumstances  in  which a read(2) completes; there are four
       distinct cases:

       * MIN == 0; TIME == 0: If data is available,  read(2)  returns  immedi-
         ately,  with the lesser of the number of bytes available, or the num-
         ber of bytes requested.  If no data is available, read(2) returns 0.

       * MIN > 0; TIME == 0: read(2) blocks until the lesser of MIN  bytes  or
         the  number  of bytes requested are available, and returns the lesser
         of these two values.

       * MIN == 0; TIME > 0: TIME specifies the limit for a timer in tenths of
         a  second.   The  timer  is  started when read(2) is called.  read(2)
         returns either when at least one byte of data is available,  or  when
         the  timer  expires.  If the timer expires without any input becoming
         available, read(2) returns 0.

       * MIN > 0; TIME > 0: TIME specifies the limit for a timer in tenths  of
         a second.  Once an initial byte of input becomes available, the timer
         is restarted after each further byte is  received.   read(2)  returns
         either  when  the lesser of the number of bytes requested or MIN byte
         have been read, or when the inter-byte timeout expires.  Because  the
         timer  is  only  started after the initial byte becomes available, at
         least one byte will be read.

I'll see if I can build something quick.
 

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ATF-SH(1)						    BSD General Commands Manual 						 ATF-SH(1)

NAME
atf-sh [-s shell] -- interpreter for shell-based test programs SYNOPSIS
atf-sh script DESCRIPTION
atf-sh is an interpreter that runs the test program given in script after loading the atf-sh(3) library. atf-sh is not a real interpreter though: it is just a wrapper around the system-wide shell defined by ATF_SHELL. atf-sh executes the inter- preter, loads the atf-sh(3) library and then runs the script. You must consider atf-sh to be a POSIX shell by default and thus should not use any non-standard extensions. The following options are available: -s shell Specifies the shell to use instead of the value provided by ATF_SHELL. ENVIRONMENT
ATF_LIBEXECDIR Overrides the builtin directory where atf-sh is located. Should not be overridden other than for testing purposes. ATF_PKGDATADIR Overrides the builtin directory where libatf-sh.subr is located. Should not be overridden other than for testing purposes. ATF_SHELL Path to the system shell to be used in the generated scripts. Scripts must not rely on this variable being set to select a specific interpreter. EXAMPLES
Scripts using atf-sh(3) should start with: #! /usr/bin/env atf-sh Alternatively, if you want to explicitly choose a shell interpreter, you cannot rely on env(1) to find atf-sh. Instead, you have to hardcode the path to atf-sh in the script and then use the -s option afterwards as a single parameter: #! /path/to/bin/atf-sh -s/bin/bash ENVIRONMENT
ATF_SHELL Path to the system shell to be used in the generated scripts. SEE ALSO
atf-sh(3) BSD
September 27, 2014 BSD
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