linux - bash if statement expected unary operator -

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I'm trying to do something on the lines of 

 , if (regular file Continue

What have I so far 

  st1 = $ (-f "$ {ARRAY [$ i]}" ) If I am receiving the "expected error operator error"   
 
 
 
 Post-text "Itemprop =" text "> 
 You do not need to create the intermediate  st1  variable just use: 
 
  if [[! -f "$ {ARRAY [$ i]}" || -H "$ {ARRAY [$ i]}"]] ;; Your use of "$ {ARRAY [$ i]}"  st1 = $ (-f "$ {ARRAY [$ i]}") is available "first  
 
 / Code> is incorrect and the reason for the syntax error will be: 
 
  -f: command not found  
 
 because on the shell  f  Think of it as a command name.

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