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Run a command for specific amount of time with an auto key press

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# 1  
Old 05-16-2015
Run a command for specific amount of time with an auto key press
Hi,

I have been trying to do a small fun project for myself.

I want to run a command for 45 seconds.

And to get the final output of this command, the script requires I push the "q" key on my keyboard and then the final output file becomes available.

I tried the following script. But it is not taking the "q" key and also runs for more than 45 seconds. I was wondering if someone could lead me on how to press a key automatically inside a bash script.

Code:
#! /bin/bash
end=$((SECONDS+45))
while [ $SECONDS -lt $end ];
do
my command execution
done
echo q

Thanks
Last edited by jacobs.smith; 05-16-2015 at 08:33 PM..
# 2  
Old 05-17-2015
Not sure if this is the optimal solution, and it requires "my command" to read from stdin:
Code:
mkfifo YY
{ sleep 45; echo q >YY; } &

read -p "my command execution" R <YY; [[ "$R" = "q" ]] && echo "back!" || echo "failed";    # this is mimicking "my command"
rm -f YY

Last edited by RudiC; 05-17-2015 at 06:00 AM.. Reason: removed "echo" from prompt
This User Gave Thanks to RudiC For This Post:
jacobs.smith
# 3  
Old 05-17-2015
Quote:
Originally Posted by RudiC
Not sure if this is the optimal solution, and it requires "my command" to read from stdin:
Code:
mkfifo YY
{ sleep 45; echo q >YY; } &

read -p "my command execution" R <YY; [[ "$R" = "q" ]] && echo "back!" || echo "failed";    # this is mimicking "my command"
rm -f YY

Rudic,

Thanks for your response. But no luck so far. The script runs but it is creating a file called YY and no output is being written into it.

To briefly tell you what I am planning to do

Code:
I want to execute a command for 45 seconds, then press the key "q". I want to loop this for 3600 seconds.

Thanks again.
# 4  
Old 05-17-2015
Works for me, please provide screen output, like:
Code:
✔ tmp $ mkfifo YY
✔ tmp $ { sleep 45; echo q >YY; } &
[1] 30908
+ tmp $ 
✔ tmp $ read -p "my command execution" R <YY; [[ "$R" = "q" ]] && echo "back!" || echo "failed";    # this is mimicking "my command"
back!
[1]+  Fertig                  { sleep 45; echo q > YY; }
✔ tmp $ rm -f YY

This User Gave Thanks to sea For This Post:
jacobs.smith
# 5  
Old 05-17-2015
Quote:
Originally Posted by sea
Works for me, please provide screen output, like:
Code:
✔ tmp $ mkfifo YY
✔ tmp $ { sleep 45; echo q >YY; } &
[1] 30908
+ tmp $ 
✔ tmp $ read -p "my command execution" R <YY; [[ "$R" = "q" ]] && echo "back!" || echo "failed";    # this is mimicking "my command"
back!
[1]+  Fertig                  { sleep 45; echo q > YY; }
✔ tmp $ rm -f YY

Please see this.

Code:
user$ mkfifo YY
user$ { sleep 45; echo q >YY; } &

[1] 33912
Code:
user$ read -p "ls -lh" R <YY; [[ "$R" = "q" ]] && echo "back!" || echo "failed";

-bash: !": event not found
Code:
user$ read -p "ls -lh" R <YY; [[ "$R" = "q" ]] && echo "back" || echo "failed";

back
[1]+ Done { sleep 45; echo q > YY; }
Code:
user$ rm -f YY

No output file is generated.
# 6  
Old 05-17-2015
Quote:
Originally Posted by jacobs.smith
Please see this.
...
-bash: !": event not found
...
What is the output of:
Code:
uname -ro
$SHELL --version

I could only think of either one of these infos beeing related to your experienced issue, though i dont know a solution.

Quote:
Originally Posted by jacobs.smith
Code:
user$ rm -f YY

No output file is generated.
Obvious, after deleting it Smilie
You do not need that file anyway, as it simply 'redirects'(creates) the virtual keypress of q.

I do have it:
Code:
[1]+  Fertig                  { sleep 45; echo q > YY; }
+ tmp $ rm -f YY^C
130 tmp $ ll YY
prw-rw-r--. 1 sea sea 0 17. Mai 16:56 YY

hth
# 7  
Old 05-17-2015
Quote:
Originally Posted by sea
What is the output of:
Code:
uname -ro
$SHELL --version

I could only think of either one of these infos beeing related to your experienced issue, though i dont know a solution.


Obvious, after deleting it Smilie
You do not need that file anyway, as it simply 'redirects'(creates) the virtual keypress of q.

I do have it:
Code:
[1]+  Fertig                  { sleep 45; echo q > YY; }
+ tmp $ rm -f YY^C
130 tmp $ ll YY
prw-rw-r--. 1 sea sea 0 17. Mai 16:56 YY

hth
Thanks for the pointers. Here is the requested info

Code:
uname -ro

uname: illegal option -- o
usage: uname [-amnprsv]

Code:
user$ $SHELL --version

GNU bash, version 3.2.48(1)-release (x86_64-apple-darwin10.0)
Copyright (C) 2007 Free Software Foundation, Inc.
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