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How to erase the file contents of text file in Python?
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In python:
open('file.txt', 'w').close()
Or alternatively, if you have already an opened file:
f = open('file.txt', 'r+')
f.truncate(0) # need '0' when using r+
In C++, you could use something similar.
sha...
How to get the primary IP address of the local machine on Linux and OS X? [closed]
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Use grep to filter IP address from ifconfig:
ifconfig | grep -Eo 'inet (addr:)?([0-9]*\.){3}[0-9]*' | grep -Eo '([0-9]*\.){3}[0-9]*' | grep -v '127.0.0.1'
Or with sed:
ifconfig | sed -En 's/127.0.0.1//;s/.*inet (addr:)?(([0-9]*\.){3}[0-9]*).*/\2/p'
If you...
How to Create Deterministic Guids
...d value. This value needed to be consistent between file upgrades. So even if everything else in the file changes, the guid value for the attribute should remain the same.
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Why is “Set as Startup” option stored in the suo file and not the sln file?
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Why should it be a non-user-specific preference?
If I've got a solution with 10 files in, and one developer is primarily testing/using one of those tools, why should that affect what I start up?
I think MS made the right choice on this one. The project I ...
Undo git mv (rename)
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If you have done no other changes (that you want to keep) since the last commit, you can do
git reset --hard
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Error: Could not find or load main class [duplicate]
...nsure that you add the location of your .class file to your classpath. So, if its in the current folder, add . to your classpath.
Note that the Windows classpath separator is a semi-colon, i.e. a ;.
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Bash script to calculate time elapsed
...e to this solution is that it only measures whole seconds, i.e. not usable if you need sub-second precision.
– Czechnology
Oct 27 '17 at 16:01
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No Main() in WPF?
...not see one when I create a WPF project. Is Main() simply named something differently in WPF?
7 Answers
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Open and write data to text file using Bash?
... the operator > redirects output to a file overwriting the file if one exists. The >> will append to an existing file.
– Rocky Pulley
May 17 '15 at 3:12
4
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How do I read the first line of a file using cat?
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There are many different ways:
sed -n 1p file
head -n 1 file
awk 'NR==1' file
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