某人的栖息地 » shell

mac下的tree命令

Volcano — Mon, 22 Nov 2010 12:34:50 +0000

在默认安装安装的mac下没有找到tree命令，找了一下原来有个比较流氓的解决办法：

find . -print | sed -e 's;[^/]*/;|____;g;s;____|; |;g'

这个命令行跑起来类似平常tree的效果，比如：

.
|____extra
| |____httpd-autoindex.conf
| |____httpd-dav.conf
| |____httpd-default.conf
| |____httpd-info.conf
| |____httpd-languages.conf
| |____httpd-manual.conf
| |____httpd-mpm.conf
| |____httpd-multilang-errordoc.conf
| |____httpd-ssl.conf
| |____httpd-userdir.conf
| |____httpd-vhosts.conf
|____httpd.conf
|____magic
|____mime.types
|____original
| |____extra
| | |____httpd-autoindex.conf
| | |____httpd-dav.conf
| | |____httpd-default.conf
| | |____httpd-info.conf
| | |____httpd-languages.conf
| | |____httpd-manual.conf
| | |____httpd-mpm.conf
| | |____httpd-multilang-errordoc.conf
| | |____httpd-ssl.conf
| | |____httpd-userdir.conf
| | |____httpd-vhosts.conf
| |____httpd.conf
|____other
| |____bonjour.conf
| |____php5.conf
|____users

写一个alias到~/.bash_profile里，就更方便了:

alias tree="find . -print | sed -e 's;[^/]*/;|____;g;s;____|; |;g'"

混合使用SQL和shell命令

Volcano — Tue, 01 Jul 2008 01:19:57 +0000

mysql下可以用批处理模式运行SQL，比如:

shell> mysql -h host -u user -p < batch-file.sql
Enter password: ********

但是平常往往需要在执行sql的同时，运行一些shell脚本进行进一步计算，保存日志之类的。这个可以靠mysql的system命令来实现，例如：

# Mixing shell commands and SQL queries in batch mode- demo script
use test;
#INSTALL PLUGIN example SONAME 'ha_example.so'; #Ignore statement
system cp /tmp/mysqld.trace logs/init.trace # Shell commands prefixed with a 'system'
create table new4(num integer) engine=EXAMPLE;
system cp /tmp/mysqld.trace logs/after_create.trace # Shell commands prefixed with a 'system'
system diff logs/init.trace logs/after_create.trace # Shell commands prefixed with a 'system'

注意

system命令只在类unix操作系统上有效。
可以在存储过程中使用system。

在命令行里执行mysql的sql

Volcano — Mon, 23 Jun 2008 03:05:39 +0000

平常执行sql，需要登录到mysql的shell下，然后再执行。比如：

$ /usr/bin/mysql -u root
mysql> select * from users;

但是如果写一点简单的脚本，也可以在命令行下直接运行sql并显示结果，比如：

$ cat executemysql.sh
#!/bin/sh

qry=$1;

echo "Executing the following query"
echo "$qry"

mysql -u root << eof
$qry
eof

运行一下:

$ ./executemysql.sh "select id,name,age from test.users limit 2"
Executing the following query
select id,name,age from test.users limit 2
id name age
3 john 20
4 tom 21

原文：Execute mysql from bash script