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<b_jonas> slashlearn block device/Block devices are a concession made in Unix to make raw hard disks and magnetic tape have a similar interface to regular files and terminals. Since magnetic tapes can\'t write individual bytes, only entire blocks, the interface isn\'t exactly the same, thus the dreaded dd obs= option was born.
author | HackBot |
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date | Fri, 17 Jun 2016 08:35:50 +0000 |
parents | 56dcce63901b |
children |
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#!/bin/bash cd /var/irclogs/_esoteric pasterandom() { if [ "$1" -gt 150 ]; then echo "No." exit fi for i in $(seq "$1"); do file=$(shuf -en 1 ????-??-??.txt) echo "$file:$(shuf -n 1 $file)" done | paste } if [ "$1" ]; then if expr "$1" + 0 >/dev/null 2>&1; then pasterandom "$1" else lines=$(timeout 25 grep -P -i -- "$1" ????-??-??.txt | head -n 301) { echo "$lines" | head -n 300 [ $(echo "$lines" | wc -l) -eq 301 ] && echo "[too many lines; stopping]" } | paste fi else pasterandom 40 fi