bash snippets

100% Load 4 CPU cores

for i in 1 2 3 4; do while : ; do : ; done &  done

show my ip

$ dig +short myip.opendns.com @resolver1.opendns.com

remove old files

Find and clean files in a directory and its subdirectories:

/usr/bin/find /dir -maxdepth 2 \( -name "access*.gz" -o -name "error*.gz" \) -a -mtime +178 -print0 | xargs -0 rm -vf 2>&1 | logger

template

#!/bin/bash

# ./script [-t DAYS] -a AGE -d DIR
#   -t today date
# ex: ./script -a 366 -d /srv/log

DAY_ZERO=0
LOG_DIR="/usr/local/empty"
SCRIPT_DIR=$( cd "$( dirname "${BASH_SOURCE[0]}" )" && pwd )
# Logging tag
LTAG="$(basename $0)[$$]"

do_log() {
    logger -t $LTAG "$*"
}

do_log "Started with params $*"

# Script params
while [ "$#" -ge "2" ] ; do
    case $1 in
        -t)
            DAY_ZERO=$2
            shift 2 ;;
        -a)
            AGE=$2
            shift 2 ;;
        -d)
            LOG_DIR=$2
            shift 2 ;;
        *) shift 1 ;;
    esac
done

find_in_dir() {
}

find_in_dir $LOG_DIR $AGE

do_log "Finished."

exit 0