Send event and data to a bash script

Question

I need to have one bash script wait on a piece of data from another.
Is there a native Linux way that I can accomplish that, preferably without the use of files which can become stale?

What sort of data? Is a pipe appropriate: another-script | one-bash-script? — Jonathan Leffler
– Jonathan Leffler, Commented Aug 27, 2016 at 4:10
you don't have to chain them either with named pipes, check for mkfifo — karakfa
– karakfa, Commented Aug 27, 2016 at 4:13
Chaining won't work. It's actually a complex service dependency in runit. But it's not enough to check if the other service is running. It outputs data that the other is dependant on. — hookenz
– hookenz, Commented Aug 27, 2016 at 4:14

hookenz · Accepted Answer · 2016-08-29 23:29:51Z

2

The way I solved this in the end was to use fifo pipes.

e.g. source.sh

#!/bin/bash

if ! [ -p "pipe" ]; then
  mkfifo -m 0600 "pipe"
fi

echo "hello world" > "pipe"

dest.sh

#!/bin/bash

if ! [ -p "pipe" ]; then
  mkfifo -m 0600 "pipe"
fi

MYVAR=$(<"pipe")
echo $MYVAR

Because writing and reading blocks, each script will not proceed until either the data is sent or read in.

answered Aug 29, 2016 at 23:29

hookenz

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Comments

Samundra · Accepted Answer · 2016-08-27 04:15:42Z

0

Is it possible to use the Subshell in the scripting? Though I personally do not have any experience with it thought you might want to try other approaches.

answered Aug 27, 2016 at 4:15

Samundra

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3 Comments

hookenz Over a year ago

Unfortunately not.

Samundra Over a year ago

Did you solve your problem ? I am also very much interested in this particular questions.

hookenz Over a year ago

I did, I'll post an answer.

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