Questions tagged [coprocesses]
The coprocesses tag has no usage guidance.
0
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1answer
20 views
How does bash coprocess achieve its pipelining?
Note this passage from man bash ( emphasis mine ):
Coprocesses
A coprocess is a shell command preceded by the coproc reserved word. A
coprocess is executed asynchronously in a subshell, as ...
1
vote
2answers
139 views
Is coproc <command> the same as <command> &? [duplicate]
I have read that $coproc < command > is different from $< command > & in that coproc will execute command in a sub-shell process.
But when I tested it, it worked just like $< ...
-3
votes
2answers
152 views
inter process comunication in bash read commands in multiple background functions
I'm trying to get the following code to read from a main input then read that in one function then be able to send that into the input of another function but i am having trouble getting it to work ...
3
votes
0answers
94 views
Why does this gawk coprocess hang?
While having a go at Convert date in bash shell, I tried GNU awk's coprocess feature:
gawk -F, -v cmd='date +"%Y-%m-%d %H:%M:%S" -f-' '{print $5 |& cmd; cmd |& getline d; $5 = d}1' foo
This ...
5
votes
1answer
127 views
Joined pipelines
Considering a routine such as this one:
alpha() { echo a b c |tr ' ' '\n'; }
which outputs a stream, I would like to take the output stream, transform it, and paste it with the original output ...
68
votes
4answers
19k views
How do you use the command coproc in various shells?
Can someone provide a couple of examples on how to use coproc?
