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How to write a cron that will run a script every day at midnight?
.../cron.d/myapp-cron
# use /bin/bash to run commands, no matter what /etc/passwd says
SHELL=/bin/bash
# Execute a nightly (11:00pm) cron job to scrub application records
00 23 * * * someuser /opt/myapp/bin/scrubrecords.php
...
How to search file text for a pattern and replace it with a given value
...ile. This is catastrophic if you're doing something like writing out /etc/passwd files as part of system configuration management.
Note that in-place file editing like in the accepted answer will always truncate the file and write out the new file sequentially. There will always be a race conditio...
Catching an exception while using a Python 'with' statement
...nally:
f.close()
Used as follows:
with opened_w_error("/etc/passwd", "a") as (f, err):
if err:
print "IOError:", err
else:
f.write("guido::0:0::/:/bin/sh\n")
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...
Why does the C preprocessor interpret the word “linux” as the constant “1”?
...le? It could also be > emptyfile.c or : > emptyfile.c or dd if=/etc/passwd of=emptyfile.c count=0 or …
– Jonathan Leffler
Oct 10 '13 at 14:07
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REDHAT 6.4 X64下ORACLE 11GR2静默安装 - 数据库(内核) - 清泛网 - 专注C/C++及内核技术
...oinstall
#groupadd -g 5001 dba
# useradd -m -g oinstall -G dba oracle
# passwd oracle
7、配置oracle 用户的环境变量
其实安装的时候有很多变量，很多是并不是必须的，以上四个是必须的。
7.1创建文件夹
创建Oracle安装文件夹以及数据存放...
Limiting floats to two decimal points
...>>> a = 13.946
>>> print(a)
13.946
>>> print("%.2f" % a)
13.95
>>> round(a,2)
13.949999999999999
>>> print("%.2f" % round(a, 2))
13.95
>>> print("{:.2f}".format(a))
13.95
>>> print("{:.2f}".format(round(a, 2)))
13.95
>>> print("...
Display a float with two decimal places in Python
...
You could use the string formatting operator for that:
>>> '%.2f' % 1.234
'1.23'
>>> '%.2f' % 5.0
'5.00'
The result of the operator is a string, so you can store it in a variable, print etc.
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解决Eclipse CDT Dark主题Editor bgcolor设置无效被覆盖的问题 - C/C++ - ...
...后，自定义设置代码区背景颜色后发现背景色永远都是 2f2f2f，用户设置的颜色无效，Google了以下发现，代码区的颜色是写死在eclipse主题的css里面的， Eclipse CDT切换Dark黑色主题后，自定义设置代码区背景颜色后发现背景色永远...
Is there a way to use SVG as content in a pseudo element :before or :after
...px;
background-image: url(data:image/svg+xml,%3Csvg%20xmlns%3D%22http%3A%2F%2Fwww.w3.org%2F2000%2Fsvg%22%20version%3D%221.1%22%20height%3D%2280%22%20width%3D%22160%22%3E%0D%0A%20%20%3Ccircle%20cx%3D%2240%22%20cy%3D%2240%22%20r%3D%2238%22%20stroke%3D%22black%22%20stroke-width%3D%221%22%20fill%3D%22...
How to display pandas DataFrame of floats using a format string for columns?
...
import pandas as pd
pd.options.display.float_format = '${:,.2f}'.format
df = pd.DataFrame([123.4567, 234.5678, 345.6789, 456.7890],
index=['foo','bar','baz','quux'],
columns=['cost'])
print(df)
yields
cost
foo $123.46
bar $234.57
baz $...