I just want to create a file filled with half of increasing numbers followed by half of decreasing numbers using pipeline. So I could automate the process to generate thousand of files. Below is my code and generated files output.
shuf -i 1-10 -n 6 | sort -n |shuf -i 11-20 -n 6|sort -r > a.txt
20 18 17 13 12 11
You can separate them into two commands:
shuf -i 1-10 -n 6 | sort -n > a.txt && shuf -i 11-20 -n 6 | sort -r >> a.txt
>> allows you to append to file
&& to execute a second command in one line