Split a gzip'ed newline separated file into multiple files by line count.

split_gzip

#!/bin/bash

file="$1";
numlines="$2"
basefile=${file%.gz}
isMore=1

function write_n_lines {
    local c=0;
    while [[ "$c" -lt "$1" ]]; do
        if ! read LINE; then
            return 0;
        fi;
        echo "$LINE";
        c=$(( $c + 1 ));
    done;
    return 1;
}

gunzip -c "$file" | pv -rbt | (
    fn=0;
    while [[ $isMore -eq 1 ]]; do
        newfile=$( printf "%s-%04d.gz" "$basefile" $fn );
        write_n_lines $numlines | pigz -c > $newfile
        isMore=${PIPESTATUS[0]}
        fn=$(( $fn + 1 ))
    done;
)