shell編程實戰21

1. 併發備份數據庫

#!/bin/bash exec &> /tmp/mysql_bak.log if ! which innobackupex &>/dev/nll then echo "安裝xtrabackup工具" rpm -ivh http://www.percona.com/downloads/percona-release/redhat/0.1-3/percona-release-0.1-3.noarch.rpm && \ yum install -y percona-xtrabackup-24 if [ $? -ne 0 ] then echo "安裝xtrabackup工具出錯，請檢查。" exit 1 fi fi bakdir=/data/backup/mysql bakuser=vyNctM bakpass=99omeaBHh function bak_data { db_name=$1 db_host=$2 db_port=$3 cnf=$4 [ -d $bakdir/$db_name ] || mkdir -p $bakdir/$db_name innobackupex --defaults-file=$4 --host=$2 --port=$3 --user=$bakuser --password=$bakpass $bakdir/$1 if [ $? -ne 0 ] then echo "備份數據庫$1出現問題。" fi } fifofile=/tmp/$$ ## 這個腳本運行的pid mkfifo $fifofile exec 1000<>$fifofile thread=10 for ((i=0;i<$thread;i++)) do echo >&1000 done cat /tmp/databases.list | while read line do read -u1000 { bak_data `echo $line` echo >&1000 } & done wait exec 1000>&- rm -f $fifofile

2. 打印三角形

　

3. 截取字符串

　

4. 修改文本格式

　

5. 自定義rm

#!/bin/bash filename=$1 if [ ! -e $1 ] then echo "$1 不存在，請使用絕對路徑" exit fi d=`date +%Y%m%d%H%M` f_size=`du -sk $1|awk '{print $1}'` disk_size=`LANG=en; df -k |grep -vi filesystem|awk '{print $4}' |sort -n |tail -n1` big_filesystem=`LANG=en; df -k |grep -vi filesystem |sort -n -k4 |tail -n1 |awk '{print $NF}'` if [ $f_size -lt $disk_size ]then read -p "Are U sure delete the file or directory: $1? y|n: " c case $c in y|Y) mkdir -p $big_filesystem/.$d && rsync -aR $1 $big_filesystem/.$d/$1 && /bin/rm -rf $1 ;; n|N) exit 0 ;; *) echo "Please input 'y' or 'n'." ;; esacelse echo "The disk size is not enough to backup the files $1." read -p "Do you want to delete $1? y|n: " c case $c in y|Y) echo "It will delete $1 after 5 seconds whitout backup." for i in `seq 1 5`; do echo -ne ". "; sleep 1;done echo /bin/rm -rf $1 ;; n|N) echo "It will not delete $1." exit 0 ;; *) echo "Please input 'y' or 'n'." ;; esacfi