linux - Bash command substitution with extra whitespace: How to solve this? -

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I would like to change the number of processes to know my command line: 

 > ; Cat / proc / "fuser / dev / ttyS0`" / cmdline cat: / proc / 5231 / cmdline: Any such file or directory   
 but it seems that  fuser < / Code> Adds an extra white space in PID  
 Expected behavior: I want to get a process ID using the  Fusor  and in the second stage of the display  / Proc / & lt; ID & gt; / Cmdline .   
 
 
 I think the  echo \ "` fuser / dev / ttyS0` \ " will show you that there is a prominent place if you split your operation in two steps, then you can do the following  
  u = `fuser / dev / ttyS0` cat / proc / $ {U /}} / cmdline   
 Then first you put the result of  fusor  on the variable  u  (which is still the location ), And then you start a paradigm shift with all the codes with  U  ( //  if you Evl  / , then the place of all events, will simply replace the first event - which will not have any problem in your example).

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