Author Archives: cgao

About cgao

Cambridge, MA

INT_MAX and INT_MIN in Python

https://stackoverflow.com/questions/7604966/maximum-and-minimum-values-for-ints In Python 2.x, one can use sys.maxint In Python 3.x, it is sys.maxsize Use float float(‘inf’) float(‘-inf’)

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Add All Amex Offers in One Second

Update: multiple tabs don’t work perfectly with this method. It may fail to load some offers. Add the offers you are to use manually if you are using multiple tabs. In Chrome, log into your account and load all offers. If … Continue reading

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ksh…

Got back to use windows… Use putty ssh to Unix server. Tab completion, up-down arrow history are not working. I thought the putty configuration is not correct.  One hour tuning the config, not working. Then I realized maybe the shell … Continue reading

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run firefox on a remote Linux server

I have a python script which opens firefox. I can ssh to my mac and run the script without issue. But when I ssh to the raspberry pi 2 (running Ubuntu Mate 15.04) and try to run the script, it … Continue reading

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freeze

Create a record of the installed libraries in a text file (requirements.txt). Dude I should have known it before… $ pip freeze > requirements.txt

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directory size and count of files

List the size of current directory and its subdirectories du -ch List the size of current directory and suppress the reports of its subdiectories du -sh Count number of current directory files/subdirectories and total files in all subdirectories echo * … Continue reading

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MITBBS archive log

05/05/15 My iMac disk space is also used up. Moved the mysql data file (/usr/local/mysql/data) to external hard drive  (/Volumes/diskname/MysqlData/data) close mysql server sudo cp -R /usr/local/mysql/data /Volumes/diskname/MysqlData/. In /usr/local/mysql/my.cnf, add “datadir =  /Volumes/diskname/MysqlData/data” restart mysql server The drawback is … Continue reading

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