The implementation method of shell randomly extracting several rows from file _linux shell

Shuf-n5 Main.txt

Sort-r Main.txt | Head-5

awk-vn=5-vc= "' wc-l file '" ' Begin{srand () while (n<n) {I=int (rand () *c+1); if (!) ( I in a)} {A[i]++;n++}}}nr in a ' file

While read Line;do echo "$line $RANDOM";d One < Main.txt | sort-k2,2n| awk ' Nr<=5{print $} '

Options for the Shuf command:

-E,--echo: treat each parameter as an input line
-I,--input-range=lo-hi: treats every number LO to HI as an input line
-N,--head-count= number of rows: Maximum output specified number of rows
-O,--output= file: Output results to specified file rather than standard output
--random-source= file: Get random bits from the specified file
-Z,--zero-terminated: ending a row with 0 instead of a new line
--help: Displays this help information and exits
--version: Display version information and exit

Example: