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Test if a command outputs an empty string
...r success, non-zero for failure). For example:
files=$(ls -A)
if [[ $? != 0 ]]; then
echo "Command failed."
elif [[ $files ]]; then
echo "Files found."
else
echo "No files found."
fi
More info here.
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jQuery find parent form
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answered Oct 25 '09 at 18:58
karim79karim79
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How can I wrap text to some length in Vim?
...tion 1 would be achieved by setting textwidth (for example :set textwidth=30 (from Swaarop's answer)). Then you can reformat your text by highlighting it (in visual mode) and typing gq. (textwidth can be abbreviated as tw, thus :set tw=30.)
Option 2 can be toggled by running :set wrap / :set nowrap...
Using .sort with PyMongo
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207
sort should be a list of key-direction pairs, that is
db.test.find({"number": {"$gt": 1}}).sor...
Is there a way to rename an Xcode 4 scheme?
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edited Mar 18 '11 at 0:59
answered Mar 18 '11 at 0:54
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Change text from “Submit” on input tag
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answered Dec 23 '12 at 0:00
Ry-♦Ry-
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Transpose/Unzip Function (inverse of zip)?
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802
zip is its own inverse! Provided you use the special * operator.
>>> zip(*[('a', 1), ...
Breaking a list into multiple columns in Latex
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edited Feb 10 '13 at 21:31
worldsayshi
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answered Se...
Is short-circuiting logical operators mandated? And evaluation order?
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edited Sep 23 '11 at 15:07
answered Mar 10 '09 at 0:37
Al...
What is the Bash equivalent of Python's pass statement
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answered Mar 10 '10 at 23:55
Ignacio Vazquez-AbramsIgnacio Vazquez-Abrams
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