[ale] how do I - icon starts script starts 4 scripts

[Scott Plante]

">&" (or "&>") together mean send standard out and standard error to the following file. They will get interpreted by the shell not get passed into mate-terminal. In other words, it's the std out/err of mate-terminal itself being sent to /dev/null. I don't know if mate-terminal actually generates any std out/err but it couldn't hurt. The second & by itself is the background one. 


Scott 
----- Original Message -----

From: "Ron Frazier (ALE)" <atllinuxenthinfo at techstarship.com> 
To: "Atlanta Linux Enthusiasts" <ale at ale.org> 
Sent: Thursday, April 18, 2013 10:50:44 AM 
Subject: Re: [ale] how do I - icon starts script starts 4 scripts 

Hi Phil, 

Thanks for the note. I'll look up the disown command. 

Wouldn't using >/dev/nul send all the output of my sub scripts to a 
black hole instead of their terminal windows? I wouldn't be able to see 
their output then. 

Also, why did you suggest a second "&" command? 

Sincerely, 

Ron 


On 4/18/2013 8:54 AM, Phil Turmel wrote: 
> Hi Ron, 
> 
> On 04/17/2013 09:35 PM, Ron Frazier (ALE) wrote: 
> 
> 
>> #!/bin/bash -eu 
>> # program to start all mining scripts 
>> cd ~/mining-scripts 
>> # commands to start the first miner 
>> mate-terminal --geometry=70x4+1800+100 -t "Miner 1" -e ./miner1& 
>> # commands to start the second miner 
>> mate-terminal --geometry=70x4+1800+250 -t "Miner 2" -e ./miner2& 
>> # commands to start the third miner 
>> mate-terminal --geometry=70x4+1800+400 -t "Miner 3" -e ./miner3& 
>> # commands to start the fourth miner 
>> mate-terminal --geometry=70x4+1800+550 -t "Miner 4" -e ./miner4& 
>> echo "Press enter to continue." 
>> read junk 
>> 
>> I have to use mate-terminal to activate Mint's terminal emulator. The 
>> --geometry option (mentioned by both you and Brian) sets the window size 
>> for each MINERx script as well as a location so they all stack up on the 
>> right of my monitor. The -t option specifies a unique title for each 
>> window. Each MINERx program is started with the "&" command (also 
>> mentioned by you and Brian) so the master script keeps on going without 
>> waiting. For some reason, I had to put the read command at the end of 
>> the START-MINERS script or the sub scripts never kick off. I have no 
>> idea why. 
>> 
> When a script ends, bash kills off any unfinished background tasks. To 
> avoid this, the script must explicitly "disown" them. However, the 
> background tasks that are still connected to the original terminal's 
> file descriptors might suicide on the loss of those pipes. 
> 
> I would rewrite your script as follows: 
> 
> #!/bin/bash -eu 
> # program to start all mining scripts 
> cd ~/mining-scripts 
> 
> # commands to start the first miner 
> mate-terminal --geometry=70x4+1800+100 -t "Miner 1" -e ./miner1&>/dev/null& 
> 
> # commands to start the second miner 
> mate-terminal --geometry=70x4+1800+250 -t "Miner 2" -e ./miner2&>/dev/null& 
> 
> # commands to start the third miner 
> mate-terminal --geometry=70x4+1800+400 -t "Miner 3" -e ./miner3&>/dev/null& 
> 
> # commands to start the fourth miner 
> mate-terminal --geometry=70x4+1800+550 -t "Miner 4" -e ./miner4&>/dev/null& 
> 
> # Disconnect the background tasks from this script 
> disown -a 
> 
> 
> 
> HTH, 
> 
> 


-- 

(PS - If you email me and don't get a quick response, you might want to 
call on the phone. I get about 300 emails per day from alternate energy 
mailing lists and such. I don't always see new email messages very quickly.) 

Ron Frazier 
770-205-9422 (O) Leave a message. 
linuxdude AT techstarship.com 
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