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What is the best way to ensure only one instance of a Bash script is running? [duplicate]
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[Terminal #1] $ lockfile -r 0 /tmp/the.lock
[Terminal #1] $
[Terminal #2] $ lockfile -r 0 /tmp/the.lock
[Terminal #2] lockfile: Sorry, giving up on "/tmp/the.lock"
[Terminal #1] $ rm -f /tmp/the.lock
[Terminal #1] $
[Terminal #2] $ lockfile -r 0 /tmp/the.lock
[Terminal #2] $
After /tmp/the...
Are HTTP cookies port specific?
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The current cookie specification is RFC 6265, which replaces RFC 2109 and RFC 2965 (both RFCs are now marked as "Historic") and formalizes the syntax for real-world usages of cookies. It clearly states:
Introduction
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For historical reasons, c...
Switching between Android Navigation Drawer image and Up caret when using fragments
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12 Answers
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How to 'minify' Javascript code
... Production (19KB, Minified and Gzipped) , and the other is Development (120KB, Uncompressed Code) .
9 Answers
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DateTime to javascript date
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edited Mar 8 '10 at 20:51
answered Mar 8 '10 at 19:55
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Assign output of a program to a variable using a MS batch file
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edited Dec 8 '15 at 13:12
Wolf
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answered Feb 26...
Why is it slower to iterate over a small string than a small list?
... closer to 70% (or more) once a lot of the overhead is removed, for Python 2.
Object creation is not at fault. Neither method creates a new object, as one-character strings are cached.
The difference is unobvious, but is likely created from a greater number of checks on string indexing, with regards...
How to check if an array field contains a unique value or another array in MongoDB?
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What is the difference between async.waterfall and async.series
The nodejs async module: https://github.com/caolan/async provides 2 similar methods, async.waterfall and async.series .
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rotating axis labels in R
...able(Ni <- stats::rpois(100, lambda=5))
r <- barplot(tN, col=rainbow(20), las=1)
That represents the style of axis labels. (0=parallel, 1=all horizontal, 2=all perpendicular to axis, 3=all vertical)
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