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How to check if a variable is set in Bash?
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2417
(Usually) The right way
if [ -z ${var+x} ]; then echo "var is unset"; else echo "var is set to ...
C# difference between == and Equals()
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17 Answers
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How to find out which processes are using swap space in Linux?
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17 Answers
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How to output only captured groups with sed?
...specifying what you do want.
string='This is a sample 123 text and some 987 numbers'
echo "$string" | sed -rn 's/[^[:digit:]]*([[:digit:]]+)[^[:digit:]]+([[:digit:]]+)[^[:digit:]]*/\1 \2/p'
This says:
don't default to printing each line (-n)
exclude zero or more non-digits
include one or more d...
What's the difference between lists and tuples?
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edited May 14 '18 at 7:50
trdngy
45955 silver badges1717 bronze badges
answered Mar 9 '09 at 16:02
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Best way to make Django's login_required the default
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edited Jul 27 '13 at 18:10
answered Jan 29 '10 at 18:33
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List of All Locales and Their Short Codes?
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7 Answers
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An operation on a socket could not be performed because the system lac...
...1024年的值和含 5000 之间分配。之后发布的安全公告 MS08-037，Windows Server 2003 的行为已更改，以便更好地匹配，Windows Server 2008 和 Windows Vista。有关 Microsoft 安全公告 MS08-037 的详细信息，请单击下面的文章编号，以查看 Microsoft 知识...
C++ blogs that you regularly follow? [closed]
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70
votes
https://stackoverflow.com/questions/tagged/c++ ;-)
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