[BK-2020-03.git] / unitproc / bkt-decimate

#!/bin/bash

decimate() {
    # Desc: Randomly remove 10% of stdin lines
    # Depends: Bash 5.1.16; GNU Coreutils 8.32 (shuf, nl, head, sort, cut)
    # Version: 0.0.1

    # Read lines
    mapfile -t lines;

    # Calc lines to keep, lk
    lc="${#lines[@]}";
    lk="$((lc * 900 / 1000))";

    # Output
    printf "%s\n" "${lines[@]}" | \
        nl -w1 -s' ' | \
        shuf | \
        head -n "$lk" | \
        sort -n -k1,1 | \
        cut -d' ' -f2- ;
}; # randomly eliminate 10% of lines

echo "$WARNING:This is a Bash function definition."
Commit	Line	Data
db51b505 SBS	1	#!/bin/bash
	2
	3	decimate() {
	4	# Desc: Randomly remove 10% of stdin lines
753047a3	5	# Depends: Bash 5.1.16; GNU Coreutils 8.32 (shuf, nl, head, sort, cut)
db51b505 SBS	6	# Version: 0.0.1
	7
	8	# Read lines
	9	mapfile -t lines;
	10
	11	# Calc lines to keep, lk
	12	lc="${#lines[@]}";
	13	lk="$((lc * 900 / 1000))";
	14
f87764cc	15	# Output
db51b505 SBS	16	printf "%s\n" "${lines[@]}" \| \
	17	nl -w1 -s' ' \| \
	18	shuf \| \
	19	head -n "$lk" \| \
	20	sort -n -k1,1 \| \
	21	cut -d' ' -f2- ;
	22	}; # randomly eliminate 10% of lines
	23
	24	echo "$WARNING:This is a Bash function definition."