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Bash script prints “Command Not Found” on empty lines
...Try running:
dos2unix script.sh
That wil convert line endings, etc from Windows to unix format. i.e. it strips \r (CR) from line endings to change them from \r\n (CR+LF) to \n (LF).
More details about the dos2unix command (man page)
Another way to tell if your file is in dos/Win format:
cat...
New Line on PHP CLI
... you generate a something on linux but want to read it on a Mac-system, or Win-system. If you don't know the target system, or it can change (--> somebody forwards a mail with a generated file as attachment), use \n
– KingCrunch
Sep 12 '14 at 12:15
...
Is there a way to include commas in CSV columns without breaking the formatting?
...ncoded as "", and the whole field will become """". So if you see the following in e.g. Excel:
---------------------------------------
| regular_value |,,,"| ,"", |""" |"|
---------------------------------------
the CSV file will contain:
regular_value,",,,""",","""",","""""""",""""
A comma...
《提升时间的使用深度》（节选） - 杂谈 - 清泛网 - 专注C/C++及内核技术
《提升时间的使用深度》（节选）时间的快和慢也常常对应着时间的深和浅。社会学家曾发现过一个时间悖论：半个多世纪以来，人们可自由支配的闲暇时间总体上一直呈增加的趋势...时间的“快”和“慢”也常常对应着时间的...
Join vs. sub-query
...version-specific and query-specific.
Historically, explicit joins usually win, hence the established wisdom that joins are better, but optimisers are getting better all the time, and so I prefer to write queries first in a logically coherent way, and then restructure if performance constraints warr...
TokuMX vs. MongoDB 性能对比 - 大数据 & AI - 清泛网 - 专注C/C++及内核技术
TokuMX vs. MongoDB 性能对比TokuDB 的ft tree 用在MongoDB产品TokuMX已经发布。MongoDB 在大量数据（比如1亿条记录）后，插入性能急剧下降。Tokutek数据带索引插入...TokuDB 的ft tree 用在MongoDB产品TokuMX已经发布。MongoDB 在大量数据（比如1亿条...
Remove multiple keys from Map in efficient way?
...key values pairs. Now I want to remove selected keys from that Map . Following code shows what I did to achieve that.
3 An...
推动“一带一路”IT产业怎么走 - 资讯 - 清泛网 - 专注C/C++及内核技术
...”倡议对其沿线国家及地区而言不仅意味着基础设施建设的提速，还有科技和文化的互联互通。如何把握机会借助“一带一路”走出去，如何在IT产业更为发达的地区站稳脚跟并抓住欠发达地区的市场，这成为目前中国IT企业必...
24种设计模式与7大原则 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...act factory pattern): 提供一个接口, 用于创建相关或依赖对象的家族, 而不需要指定具体类.生成器模式(B...创建型模式
抽象工厂模式(Abstract factory pattern): 提供一个接口, 用于创建相关或依赖对象的家族, 而不需要指定具体类.
生成...
如何查看Oracle用户的SQL执行历史记录？ - 数据库(内核) - 清泛网 - 专注C/...
如何查看Oracle用户的SQL执行历史记录？select * from v$sqlarea t order by t LAST_ACTIVE_TIME desc注意 ：执行此语句等等一些相关的语句 必须具有DBA 的权限 虽然
select * from v$sqlarea t order by t.LAST_ACTIVE_TIME desc
注意 ：执行此语句等等一些相...