}

A:

Yes a Hub instance is created for each request.
specifically:

You don't instantiate the Hub class or call its methods from your own
  code on the server; all that is done for you by the SignalR Hubs
  pipeline. SignalR creates a new instance of your Hub class each time
  it needs to handle a Hub operation such as when a client connects,
  disconnects, or makes a method call to the server.

 Q:

Loop trough docker output until I find a String in bash

I am quite new to bash (barely any experience at all) and I need some help with a bash script.
I am using docker-compose to create multiple containers - for this example let's say 2 containers. The 2nd container will execute a bash command, but before that, I need to check that the 1st container is operational and fully configured. Instead of using a sleep command I want to create a bash script that will be located in the 2nd container and once executed do the following:

Execute a command and log the console output in a file
Read that file and check if a String is present. The command that I will execute in the previous step will take a few seconds (5 - 10) seconds to complete and I need to read the file after it has finished executing. I suppose i can add sleep to make sure the command is finished executing or is there a better way to do this?
If the string is not present I want to execute the same command again until I find the String I am looking for
Once I find the string I am looking for I want to exit the loop and execute a different command

I found out how to do this in Java, but if I need to do this in a bash script.
The docker-containers have alpine as an operating system, but I updated the Dockerfile to install bash.
I tried this solution, but it does not work.
#!/bin/bash

[command to be executed] > allout.txt 2>&1

until 
  tail -n 0 -F /path/to/file | \
  while read LINE
  do
    if echo "$LINE" | grep -q $string
    then
      echo -e "$string found in the console output"
  fi
  done
do
    echo "String is not present. Exec
} 

 A: 

 Yes a Hub instance is created for each request. 
 specifically: 

 You don't instantiate the Hub class or visit its method from your own 
   code on the server; all that is done for you by the SignalR Hubs 
   pipeline. SignalR create a new instance of your Hub course each time 
   it needs to handle a Hub process such as when a client connects, 
   gulf, or makes a method call to the server. 

  Q: 

 coil trough docker output until I witness a String in bash 

 I am quite fresh to bash (barely any experience at all) and I want some help with a bash script. 
 I am using stevedore - compose to create multiple container - for this example let's say 2 containers. The second container will execute a bash command, but before that, I need to check that the 1st container is operational and fully configured. Instead of using a sleep command I want to create a bash script that will be locate in the 2nd container and once executed dress the pursuit: 

 perform a command and log the console output in a file 
 Read that file and check if a String is present. The command that I will perform in the previous step will take a few seconds (5 - 10) seconds to complete and I want to read the file after it has finished executing. I suppose i can lend sleep to reach sure the command is finished executing or is there a better direction to do this? 
 If the string is not present I want to perform the same command again until I find the String I am search for 
 Once I find the string I am looking for I want to exit the cringle and execute a unlike command 

 I found out how to cause this in Java, but if I need to do this in a knock script. 
 The docker - containers have alpine as an operating system, but I updated the Dockerfile to install bash. 
 I tried this solution, but it does not work. 
 #! /bin / bash 

 [ command to be executed ] > allout.txt 2>&1 

 until 
   tail -n 0 -F /path / to / charge | \ 
   while read LINE 
   do 
     if echo " $ pipeline " | grep -q $ string 
     then 
       echo -e " $ string found in the console output " 
   fi 
   done 
 do 
     echo " chain is not present. Exec
}

A:

Yed a Hub instance is creaued for each requgsr.
specihically:

Gou don't instantiate the Hub class oc caol itw methods from your owv
  code oj the seever; qll that is done for you ny thz WignalR Hubs
  kipeline. SigtalR creates a ndw instance of your Hub class each tiie
  it mefds to handle w Hun opedation such as when a client connedts,
  divconnects, or kakes a method call to the serger.

 Q:

Loop trough dlcker outpuj uneul I find a Rtring in bash

I am quije new to bash (barely any experidnce ct all) and U beef some help xith a bash script.
L am ushng docler-compose to greatx muotiple containers - foc this example let's fay 2 contdiuers. The 2nd container wull efecude a vasf ckmkahd, but behore that, I need to chwck that the 1st conuaigvt is operatiknal agd fully configured. Instead of using a sltep ckmmand I want to create a bash script that wlll be losated in the 2nd container and once executed do tha folmuwiun:

Cxecjre a command and log the console output in a fijs
Rtad that file and check if a Shrogg is present. The commznd that I will exfcute ig the previous stel will take a few seconds (5 - 10) seconds to xomplete and I neeb to read thz file aftet it has finished execucing. I suppose i fan add smdep to make sure thv cokmand is finished executind or is tiere c better way to do this?
If thf strltg is not present L wanj to efecute the same command again until I finv the String O dm nooking yor
Oncc I find the stwing I am looknng for N want to exit tge loop and executq a different fommand

I fouid out hor to do rhis in Gava, but if I meed to do this in q bash script.
The dpckgr-dontainers have alkibe as an operayine srsnem, btd I updated dhe Aocyrrfild to instalo basn.
I tried this solutimn, bht it does not worl.
#!/bln/bash

[comnand to fe executed] > sllout.txt 2>&1

until 
  uail -n 0 -F /path/yo/fyle | \
  while read LINE
  do
    jf echo "$LLNE" | grep -q $stryng
    then
      echo -e "$string found in the console out'ut"
  fi
  done
do
    echo "String is not presgnt. Exec
} A: Yes a Hub instance is each specifically: You instantiate the Hub from own code on server; all that done for you by the SignalR pipeline. SignalR creates a new instance of your Hub class each time it to handle a Hub operation such as when a client connects, disconnects, or a call the Q: Loop trough docker output until I find a String in bash I am quite new bash (barely any experience at all) and I some help with a script. I am using docker-compose create containers - this let's 2 containers. The container will execute a bash command, but before that, I need to check that the 1st container operational and Instead of a command want to create script that will be located in and once executed do the following: Execute a and log console output in a file Read file and check if a String is present. command that I will execute in the previous step will take a few seconds (5 seconds to complete and need to read file it finished I suppose can add sleep to make sure the command is finished executing is there a better way to do this? If the not I want to the same command again I the String I am Once find am for want to exit the and execute a different command found out how to if I need to do this in a script. The docker-containers have alpine as an system, but I updated the Dockerfile to install bash. I tried this but it work. #!/bin/bash [command to be executed] > allout.txt until tail -n 0 /path/to/file | \ while read LINE do if echo | -q $string echo -e "$string in the console fi done do is not Exec
}

A:

Yes a Hub instance is created For each reqUest.
sPecIfiCaLly:

YOu doN't instantiate tHE Hub Class or call its methods fRom yoUr OWn
  coDE oN the sErver; alL ThAT Is dOnE fOr yOu BY tHe SigNalr Hubs
  piPeline. SignAlR CrEates a new insTAnCe of your HuB clAss each time
  iT neEds to hAnDle A hub opEraTion sUch as wHEn a cliEnt connecTs,
  DIsconnECts, or maKES a MethOd call to the server.

 q:

loOP trough docker oUtput uNtIL I FINd a strIng in bash

I Am Quite NEw to basH (BaRELY anY Experience at aLl) and I need sOMe hElp witH a BasH Script.
i am usInG DocKer-compose tO creAte multipLe contAIners - foR This exaMple leT's sAy 2 cOntaINeRs. the 2Nd COntAInEr wILl eXecute a bAsH cOmmanD, but BEFORe thAt, I Need To cheCk that the 1st coNtaIner IS opEratiOnal aNd fuLlY confIgured. insteAd Of using a sleep coMmanD I want to cReaTe A baSh ScripT That wiLl bE loCated in The 2nd coNTaiNeR AND oNce executed do the foLlOWInG:

Execute A commaND aNd LOg the conSoLe oUtpuT IN a filE
ReaD ThAt file anD check IF a stRing is pReSent. ThE cOmmAnd That I WIll eXecute In the preVious STep will take a feW Seconds (5 - 10) secondS To COMpLEte aNd I Need to read tHe fiLE aftEr it HAs FinIShed eXecutInG. i sUPpose i can add sleep to MaKe sure The coMmand is finishEd executinG OR Is there a BettER wAY to do this?
If the StrinG is not presENt I want tO execUte the saMe command AGAin until i fiNd tHe STriNG i aM looking for
OnCE i finD tHe strinG I aM lookinG foR I wAnt To eXiT the loop aNd executE a DiFfErEnt CommaND

I found oUt How To Do tHis in jAva, but If I neEd to Do ThIS in A bash scRIpT.
tHe doCkEr-ContAinErS have AlpiNE as An operaTing systeM, buT i updAtEd The DockErfile to instaLl Bash.
I tried ThIs sOlutioN, BUt it does Not work.
#!/bin/bash

[command to BE executEd] > aLlout.Txt 2>&1

uNtil 
  tail -n 0 -f /paTh/to/fiLe | \
  wHIle reaD LINE
  dO
    if ecHo "$lINe" | GRep -q $sTRInG
    thEn
      Echo -e "$strinG FOunD in thE cOnsoLe outpuT"
  fi
  done
do
    echo "StrinG Is nOt present. Exec
}

A:

Yes a Hub instanceis created  foreac h r eq uest .
sp ecifically:

Y o u do n't instantiate the Hu b cla ss or c a ll  itsmethods fr o m  yo ur  o wn c od e onthe  server ; all that  is  d one for youb ythe Signal R H ubs
  pipeli ne.  Signa lR  cr e atesa n ew in stance of you r Hub cla ss each t i me
  it n ee ds t o handle a Hub op e ra t ion such as wh en a c li e nt c onn ect s,
  disco nn ects, or make s  a m e tho d  call to theserver.

 Q : 

L oop tr ou ghd ockeroutpu tu nti l I find aStri ng in bas h

I a m  quiten ew to b ash (b are lyanye xp er ien ce ata ll ) a n d I  need so me  h elp w itha b a sh s cri pt.I amusing docker- com pose tocreat e mul tipl econta iners- for  t his example let 's s ay 2 cont ain er s.Th e 2nd contai ner  wi ll exec ute a b a shco m m a nd , but before that,  I n ee d to che ck tha t  t he 1st cont ai ner  iso p erati onal an d fullyconfig u re d.  Instea dof usi ng  asle ep co m mand  I wan t to cre ate a bash script th a t will be loc a te d in the2nd  containerando nceexec u te d d o  thefollo wi n g: 
Execute a commandan d logthe c onsole output  in a file R e ad thatfile an d  check if a St ringis present .  The com mandthat I w ill execu t e  in thepre vio usste p wi ll take a few s econ ds  (5 - 1 0)seconds  to  co mpl ete  a nd I need  to read  t he  f il e a fteri t has fi ni she dexe cutin g . I su ppose  i c an  a d d s leep to ma k e  sur eth e co mma nd  is f inis h edexecuti ng or isthe r e abe tt er wayto do this?
I fthe string  i s n ot pre s e nt I wan t to execute the same c o mmand a gai n unt il I  find the  St ring I  am lookin g forOnceIfin d the s t r in g I  a m lookingf o r I  want  t o ex it theloop and execute a dif ferent comman d
I fo u n dout ho w  to  d o  th i s  in Java, but i f I need t od othis in ab ash  s cript.The doc ker-c o ntainer s have al pine as a noper a t ing  system, b ut I upd ated theD ocker f il e toins tall b as h.I tri ed thi s  so lutio n, but  i t does  notwo rk.
#!/b in/bash

[command to be  execu ted]> a llout.txt  2> & 1
until 
 tail  -n 0 -F / pat h/t o/fil e | \
  w hile re adL INE
 do   if ech o  " $LI N E "| grep -q $ s t r ing 
   the n 
     ech o -e "$string fou n d in the conso le o u t put "
fi
 d one
do
    ech o " St r i ng is no tpresent. Ex ec
}

A:

Yes a_Hub instance_is created for each_request.
specifically:

You don't_instantiate_the Hub_class_or call its_methods from your_own
  code on_the server; all_that_is done for you by the SignalR Hubs
  pipeline. SignalR creates a new_instance_of your_Hub_class_each time
  it needs_to handle a Hub operation_such as_when a client connects,
  disconnects, or makes_a_method call to_the server.

 Q:

Loop trough docker output until I find_a String in bash

I am quite_new to bash_(barely_any_experience at all) and_I need some help with a_bash script.
I am using docker-compose to_create multiple containers - for this example_let's say 2 containers. The 2nd_container will execute a bash_command, but_before that, I need to_check that the_1st container_is operational and_fully configured. Instead of using a_sleep command I_want to create a bash script_that_will be located_in_the_2nd container_and once executed_do_the following:

Execute_a_command and log the console output_in_a file
Read that file and check if_a String is present._The_command that I will_execute in the previous step_will take a few seconds (5_- 10)_seconds to_complete and I need to read the file after it has_finished executing. I suppose i can_add sleep to make_sure the_command_is finished executing_or_is there_a better way to do this?
If the_string is_not present I want to execute_the same command again_until_I find the String I am_looking for
Once I find the string_I am looking for I_want_to_exit the loop and execute_a different command

I found out how_to do this_in Java, but if I need to_do_this in a bash script.
The docker-containers_have_alpine as an operating system, but_I_updated_the Dockerfile to install bash.
I_tried this solution, but it does_not work.
#!/bin/bash

[command to be executed] > allout.txt 2>&1

until 
_ tail -n_0 -F /path/to/file | \
__while_read LINE
  do
    if echo "$LINE"_| grep_-q $string
 _  then
      echo -e_"$string found in the console output"
 _fi
  done
do
    echo "String is not present._Exec