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How to redirect the output of the time command to a file in Linux?
...more intuitive to do further processing.
{ time sleep 1; } 2>&1 | cat > time.txt
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How do I read the source code of shell commands?
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Try the source for cat. It's only 767 lines.
– Drew Noakes
Sep 23 '14 at 23:08
3
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通过 ulimit 改善系统性能 - 操作系统(内核) - 清泛网 - 专注C/C++及内核技术
...序都不会受其影响：
Shell 进程 1
ulimit – s 100
cat testFile > newFile
File size limit exceeded
Shell 进程 2
cat testFile > newFile
ls – s newFile
323669 newFile
那么，是否有针对某个具体用户的资源加以限制的方法呢？答...
How to add a downloaded .box file to Vagrant?
...ded .box file to Vagrant's list of available boxes? The .box file is located on an external drive.
8 Answers
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Upgrade python packages from requirements.txt using pip command
...grade
Advanced usage
If the requirements are placed in a non-standard location, send them as arguments:
pip-upgrade path/to/requirements.txt
If you already know what package you want to upgrade, simply send them as arguments:
pip-upgrade -p django -p celery -p dateutil
If you need to upgrad...
How do I remove a key from a JavaScript object? [duplicate]
...http://underscorejs.org/#omit
var thisIsObject= {
'Cow' : 'Moo',
'Cat' : 'Meow',
'Dog' : 'Bark'
};
_.omit(thisIsObject,'Cow'); //It will return a new object
=> {'Cat' : 'Meow', 'Dog' : 'Bark'} //result
If you want to modify the current object, assign the returning object to the c...
一次「Too many open files」故障 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...最大文件数到底是多少呢？可以通过 proc 确认：
shell> cat /proc/<PID>/limits
结果是「4096」，我们还可以进一步看看 ElasticSearch 打开的都是什么东西：
shell> ls /proc/<PID>/fd
问题看上去非常简单，只要加大相应的配置项应该就可以...
[解决]CTRL: PTY read or GRE write failed - 更多技术 - 清泛网 - 专注C/C++及内核技术
...ptp vpn服务器连接失败出现以下日志内容:（查看系统日志[cat var log messages |grep pptpd]后发现）GRE: read(fd=6,buffer=80504c0...pptp vpn服务器连接失败出现以下日志内容：
（查看系统日志[ cat /var/log/messages |grep pptpd ]后发现）
GRE: read(fd=6,...
Recommended way to get hostname in Java
... resolve to several IP Addresses. And not all of those addresses must be located on the same computer! (Usecase: A simple form of load-balancing)
Let's not even start talking about dynamic IP addresses.
Also don't confuse the name of an IP-address with the name of the host (hostname). A metaphor mi...
Elastic Search: how to see the indexed data
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Facets are now deprecated
– notapatch
Jul 6 '14 at 16:36
Thanks...