记录工作过程中使用的shell，以及相关。部分以图片形式保存到flickr。

workday-shell-history.md

• 批量处理

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以回帖的形式进行记录。

中文版SecureCRT的配置转成英文版配置

winse@Lenovo-PC /cygdrive/e/work/XXX/git/ssh-config/Config/Sessions
$ find . -type f -name '*.ini' | xargs  sed -i -e '/D:"\[SSH2\] Port"=/'d  -e 's/D:"\[SSH2\] 端口"=\(.*\)/\0\nD:"[SSH2] Port"=\1/'

无密钥登录

ssh-copy-id -i ~/.ssh/id_rsa.pub root@cluster

for a in `cat /etc/hosts | grep '192\.168' | awk '{print $1}' ` ; do ssh-copy-id -i ~/.ssh/id_rsa.pub $a ; done 

scp ~/.ssh/id_rsa.pub root@cluster:~/.ssh/id_rsa.pub.master1
ssh root@cluster
cd .ssh
cat id_rsa.pub.master1 >> authorized_keys

• 如果一台机器要与多台机器，可以先在本机生成authorized_keys，再复制到各台机器

cd .ssh
cp id_rsa.pub  authorized_keys
for h in `cat /etc/hosts | grep 'slave' ` ; do  scp ~/.ssh/authorized_keys $h:~/.ssh/ ; done

• 远程操作

ssh user@host 'mkdir -p .ssh && cat >> .ssh/authorized_keys' < ~/.ssh/id_rsa.pub

shell中获取到秒的时间

[hadoop@umcc97-44 pack]$ date '+%s' 
1403511963

less显示行号

 -N or --LINE-NUMBERS

查看hbase的状态

 echo status | hbase shell 2>/dev/null

查看集群运行任务的内存使用情况

for h in `cat hadoop-2.2.0/etc/hadoop/slaves | grep -v '#' ` ; do ssh $h "/usr/local/jdk1.7.0_17/bin/jps -m | grep YarnChild | awk '{print \$1}' | xargs -I{} /usr/local/jdk1.7.0_17/bin/jstat -gcutil {} "; done

log4j日志附带线程信息

%t

取表格的第二行

$("#list tr:eq(1)")

选择第一行，用 $('tr:fisrt')
选择第N行用 $('tr:eq(n-1)')
$("tr td:nth-child(2)")