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here's what I meant
https://github.com/vomv1988/bash_IPC

I didn't know that! Thanks for the info.

No, you see: I haven't tried to "write one byte at a time", what I'm trying to do is READ one byte at a time. cat ${INPUT} is not "in the grab_a_byte" function, it's in the listen function. cat...

If

printf '\x0a' | xxd -cols 1produces

0000000: 0a .then, why does

printf '%c' "`printf '\x0a'`" | xxd -cols 1produce

0000000: 00 .??

Ok, I rewrote the whole script, and came up with this:

#!/bin/bash

# Functions:

function makedir() {
DIR_NAME=${1}
if test -e "${DIR_NAME}" -a ! -d "${DIR_NAME}" ; then
...

I tried this very code and I am still getting the undesired behavior from my original post. It's funny how the amount of bytes I get from FIFO seems to be system-dependent; more specifically, it...

I'm currently using bash in a mac, but I was testing the code from the original post also in GNU/Linux, in bash too.

I see how several unterminated instances of the 'listen' section would cause...

The output is the same with that change, but thanks for trying anyway. After removing the sed filter from the original script I posted, the output looks something like:

y: print next byte
n:...

I want to develop a script of the following form:

#!/bin/bash

# Function 'listen' opens a data stream
# which stores all incoming bytes in
# a buffer, preparing them to be
# grabbed by a...

This bit...
...inspired me to search for "make stdout unbuffered bash" in google, which led me to a stack overflow thread...

Hi. I'm having trouble writing a wrapper script for the command line text editor gnu ed (http://www.gnu.org/software/ed/).

I want to be able to run the following algorithm on ed:

1. Display, on...

Ahhh... so the trick is in the timing then... Nice one.

---------- Post updated 03-27-12 at 12:57 PM ---------- Previous update was 03-26-12 at 03:08 PM ----------

I recently found this unusual...

Yes, in a way, they are, and you are correct to state that the functionality of the original script is not altered by their absence. My intention in putting them there was only to emphasize how a...

I agree with your mkfifo sugestion, but in regards to my usage of (), let me explain:

Suppose you want to extract a fixed amount of data, say, 20 bytes, from a device file which spits data out in...

I would recommend Bruce Blinn's "Portable shell programming, an extensive collection of bourne shell examples", along with Seebach's "Portable Shell Scripting: From Novice to Professional" and,...

Always remember to "Make every program a filter":

script.sh:
#!/bin/bash

proc ()
{
while read -r line
do
typeset -i count=`echo -E "$line" | tr ' ' '}' | wc...

Excellent point. Then, maybe something like:
#!/bin/bash

TMPFIFO="/tmp/fifo.$$"

mknod $TMPFIFO p

(
echo 'value' > $TMPFIFO &
)

VARIABLE=`cat $TMPFIFO`
rm $TMPFIFO


Thank...

A not-too-ugly solution to this classic problem...
#!/bin/bash

mknod fifo p

(
echo 'value' > fifo &
)

VARIABLE=`cat fifo`
rm fifo
Whatdcha think? Good? No good?