- The colour codes:
Black 0;30 Dark Gray 1;30 Blue 0;34 Light Blue 1;34 Green 0;32 Light Green 1;32 Cyan 0;36 Light Cyan 1;36 Red 0;31 Light Red 1;31 Purple 0;35 Light Purple 1;35 Brown/Orange 0;33 Yellow 1;33 Light Gray 0;37 White 1;37
- Example:
RED='\033[0;31m' NO_COLOR='\033[0m' echo -e "${RED}Hello World${NO_COLOR}"
Search This Blog
echo with color in shell script
grep to exclude lines with specific strings
grep with -v (invert) option will exclude the match lines in the output:
cat country.txt | grep -v "United States"
Python: check if file or directory exists
- os.path.exists to check if file or directory exists.
import os
os.path.exists('/tmp/1.txt')
os.path.exists('/tmp') - os.path.isfile to check if file exists.
import os
os.path.isfile('/tmp/1.txt')
Python: Get file absolute path
Use os.path.abspath function:
import os
os.path.abspath('abc/abc.txt')
Clear history of QuickTime Player on Mac OS X
- To clear recent items, File>Open Recent>Clear Menu
- To prevent the history from being created, run the following commands in Terminal:
defaults write com.apple.QuickTimePlayerX NSRecentDocumentsLimit 0 defaults delete com.apple.QuickTimePlayerX.LSSharedFileList RecentDocuments defaults write com.apple.QuickTimePlayerX.LSSharedFileList RecentDocuments -dict-add MaxAmount 0
Clear history of MplayerX for Mac
Open Terminal and type the following command:
defaults delete org.niltsh.MPlayerX.LSSharedFileList RecentDocumentsTo prevent history from being created:
defaults write org.niltsh.MPlayerX NSRecentDocumentsLimit 0
Python: get the index of a char in a string
find and index method are available. The difference is that find returns -1 when what you're looking for isn't found, index throws an exception.
s='abc'
print(s.index('b')) # 1
print(s.find('b')) # 1
print(s.find('d')) # -1
print(s.index('d')) # exception
Python: string types in 2.x and 3.x
- In Python 2.x, basestring is the base class for both str and unicode, while types.StringType is str. If you want to check if something is a string, use basestring. If you want to check if something is a ascii (bytestring), use str and forget about types.
- Since Python 3.x, types not longer has StringType; str is always unicode. basestring no longer exists.
python: return inside with block
if returns value inside with statement, will the file be closed eventually?
The answer is YES
The answer is YES
with open('myfile.txt') as f:
return [line for line in f if len(line)>80]
Ubuntu: system wide proxy settings
- edit /etc/bash.bashrc
export http_proxy=http://192.168.1.100:8000/ export https_proxy=http://192.168.1.100:8000/ export ftp_proxy=http://192.168.1.100:8000/ export no_proxy=localhost,127.0.0.0/8,192.168.0.0/16,*.somedomain.org,172.23.65.*
python: iterables and iterators
A class with __iter__() method or __getitem__() method is iterable. The __iter__() method returns an iterator. A iterator object has a next() method (or __next__() method in python 3.0).
class Iterator(object):
def next(self):
pass
class Iterable(object):
def __iter__(self):
return Iterator()
see also
python: len() function and __len__() method
len is a function to get the length of a collection. It works by calling an object's __len__ method.
class AClass(object):
def __init__(self):
self._list = [1,2,3]
def __len__(self):
return len(self._list)
a=AClass()
print(a.__len__()) # 3
print(len(a)) # 3
python: call another static method
class AClass(object):
def __init__(self):
pass
@staticmethod
def a():
AClass.b()
@staticmethod
def b():
pass
see also
Install thinkfan fan control utility on Lenovo thinkpad laptops
I.Installation
- Install thinkfan from repository:
sudo apt-get install thinkfan
- Enable fan control in thinkpad_acpi module configuration:
sudo echo "options thinkpad_acpi fan_control=1" > /etc/modprobe.d/thinkpad_acpi.conf
- Reload thinkpad_acpi module:
sudo rmmod thinkpad_acpi; sudo modprobe thinkpad_acpi
- Set to start thinkfan automatically at boot time:
sudo vi /etc/defaults/thinkfan
START=yes
II.Customization
- Install lm-sensors:
sudo apt-get install lm-sensors
- To check the temperatures of the sensors:
sensors
- To modify the thinkfan fan control settings:
sudo vi /etc/thinkfan.conf
Subscribe to:
Posts (Atom)