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inexplicable errors by running bash script

On Ubuntu Linux systems can happen to receive unexplained errors when executing bash script. Trying to run the following script, for example:

 # / bin / bash # 
 
 testall.sh 
 
 nets = (0 1 2 3 4 5 6 7 8 9 10 11 12 13 16 17) 
 jobs = ( 32 25 28 18 10 50 33 12 13 11 11 14 18 14 13 13 ) 
 
 # get length of array 
 length = $ {# nets [@]} 
 
 # use for loop to read test values \u200b\u200b
 for ((i = 0; the <${length}; ++i )); 
 do 
 net_ echo $ {nets [$ i] 
}. / main {$ jobs [$ i]} {$ net_ nets [$ i]} 
 echo-e "\\ n" exit 0 
 done 
 
 
 

There is no error, but on the systems mentioned above, when you type the following command sh testall.sh you get this error message

 testall.sh: 3: Syntax error: "(" unexpected 

the problem is really very subtle and thus difficult to solve.
How
said that at issue is a script bash, / bin / sh is a symbolic link which normally refers to / bin / bash and if so it should work properly. Unfortunately often / bin / sh other hand, refers to the program / bin / dash , and then the syntax is not interpreted correctly and you get an error. To resolve

• just change the symbolic link / bin / sh to point to / bin / bash

or, alternatively,

• make our script executable and run it as follows . / Testall . sh in this way, the correct interpreter is automatically selected as the launch of script.