I was trying to assign below command(which choose the random line from file) to a variable, but not working.

givinv@87-109:~$ head -$((${RANDOM} % `wc -l < file` + 1)) file | tail -1 cower givinv@87-109:~$ 

Below the the error I am getting while trying to assign it to a variable.

givinv@87-109:~$ VARIA=`head -$((${RANDOM} % `wc -l < file` + 1)) file | tail -1` bash: command substitution: line 1: unexpected EOF while looking for matching `)' bash: command substitution: line 2: syntax error: unexpected end of file bash: command substitution: line 1: syntax error near unexpected token `)' bash: command substitution: line 1: ` + 1)) file | tail -1' -l: command not found givinv@87-109:~$ 

I even tried same with for loop and not working::

givinv@87-109:~$ for i in `head -$((${RANDOM} % `wc -l < file` + 1)) file | tail -1`;do echo $i ;done bash: syntax error near unexpected token `<' givinv@87-109:~$