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How can I use a file in a command and redirect output to the same file without truncating it?
...can use a temporary file though.
#!/bin/sh
tmpfile=$(mktemp)
grep -v 'seg[0-9]\{1,\}\.[0-9]\{1\}' file_name > ${tmpfile}
cat ${tmpfile} > file_name
rm -f ${tmpfile}
like that, consider using mktemp to create the tmpfile but note that it's not POSIX.
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return query based on date
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440
You probably want to make a range query, for example, all items created after a given date:
db....
Adding a new SQL column with a default value
...for the syntax to add a column to a MySQL database with a default value of 0
10 Answers
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Easy way to list node modules I have npm linked?
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edited Jul 24 '14 at 15:06
answered Jul 24 '14 at 14:13
m...
How often does python flush to a file?
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340
For file operations, Python uses the operating system's default buffering unless you configure i...
Merging two images in C#/.NET
Simple idea: I have two images that I want to merge, one is 500x500 that is transparent in the middle the other one is 150x150.
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How to get the anchor from the URL using jQuery?
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208
You can use the .indexOf() and .substring(), like this:
var url = "www.aaa.com/task1/1.3.html#...
bool to int conversion
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208
int x = 4<5;
Completely portable. Standard conformant. bool to int conversion is implicit!...
Plot a bar using matplotlib using a dictionary
...ort matplotlib.pyplot as plt
D = {u'Label1':26, u'Label2': 17, u'Label3':30}
plt.bar(range(len(D)), list(D.values()), align='center')
plt.xticks(range(len(D)), list(D.keys()))
# # for python 2.x:
# plt.bar(range(len(D)), D.values(), align='center') # python 2.x
# plt.xticks(range(len(D)), D.keys(...