Generating random number between 1 and 10 in Bash Shell Script

Question

How would I generate an inclusive random number between  1 to 10 in Bash Shell Script   Would it be   RANDOM 1 10

User · Answer

To generate random numbers with bash use the  RANDOM internal Bash function  Note that  RANDOM should not be used to generate an encryption key   RANDOM is generated by using your current process ID  PID  and the current time date as defined by the number of seconds elapsed since 1970    echo  RANDOM   10   1   bc

User · Answer

Simplest solution would be to use tool which allows you to directly specify ranges  like gnu shuf  shuf -i1-10 -n1   If you want to use  RANDOM  it would be more precise to throw out the last 8 numbers in 0   32767  and just treat it as 0   32759  since taking 0   32767 mod 10 you get the following distribution  0-8 each  3277  8-9 each  3276   So  slightly slower but more precise would be  while    do ran  RANDOM    ran  lt  32760    amp  amp  echo     ran 10  1    amp  amp  break  done

User · Answer

To generate in the range   0    9   r      RANDOM   10     echo  r  To generate in the range   40    49   r      RANDOM   10   40     echo  r

User · Answer

You can also use  dev urandom   grep -m1 -ao   0-9    dev urandom   sed s 0 10    head -n1

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Here is example of pseudo-random generator when neither  RANDOM nor  dev urandom is available     echo   date   S    grep -o       sed s 0 10

User · Answer

RANDOM   10      1      EDIT  Changed brackets into parenthesis according to the comment  http   web archive org web 20150206070451 http   islandlinux org howto generate-random-numbers-bash-scripting

[bash] Generating random number between 1 and 10 in Bash Shell Script

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