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Top Forums Shell Programming and Scripting Grab exactly one byte from a FIFO, at random intervals Post 302747903 by Yoda on Sunday 23rd of December 2012 04:50:11 PM
Old 12-23-2012
Here is the code:
Code:
#!/bin/bash

MY_INPUT=INPUT
MY_FIFO=FIFO

(
tail -f ${MY_INPUT} | while IFS= read -n 1 CHAR ; do
        printf "${CHAR}" > ${MY_FIFO}
done
) &
READPID=$!

PROMPT=n
while [ "${PROMPT}" != "q" ]
do
        printf 'y: print next byte\nn: don'"'"'t print next byte\nq: quit\n'
        read -n 1 PROMPT
        printf '\n'
        if [ "${PROMPT}" = "y" ]
        then
# This is 'grab1byte':
                echo The input byte is:
                xxd -cols 1 ${MY_FIFO} | sed 's/^.*: //'
        fi
done

kill $READPID

 

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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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