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How to make “if not true condition”?
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try
if ! grep -q sysa /etc/passwd ; then
grep returns true if it finds the search target, and false if it doesn't.
So NOT false == true.
if evaluation in shells are designed to be very flexible, and many times doesn't require chains of commands (as you have written).
Also, looking a...
How to convert a double to long without casting?
What is the best way to convert a double to a long without casting?
9 Answers
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iOS app error - Can't add self as subview
I received this crash report, but I don't know how to debug it.
19 Answers
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Put buttons at bottom of screen with LinearLayout?
I have the following code, how do I make it so that the 3 buttons are at the bottom?
9 Answers
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Add leading zeroes to number in Java? [duplicate]
... better way of getting this result? This function fails if num has more digits than digits, and I feel like it should be in the library somewhere (like Integer.toString(x,"%3d") or something)
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Get a list of all threads currently running in Java
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To get an iterable set:
Set<Thread> threadSet = Thread.getAllStackTraces().keySet();
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Overwriting my local branch with remote branch [duplicate]
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first, create a new branch in the current position (in case you need your old 'screwed up' history):
git branch fubar-pin
update your list of remote branches and sync new commits:
git fetch --all
then, reset your branch to the point where origin/branch points to:
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Where is android studio building my .apk file?
...building my project from the ground up, so there's been a lot of problems with it. At the moment, everything's working great, except that when I try to run the app, I get the message 'Local path doesn't exist.' , where the local path is pointing at the path: AndroidStudioProjects\MyProject\MyProje...
What is an index in SQL?
...L server has to walk through the whole table and check every row to see if it matches, which may be a slow operation on big tables.
The index can also be a UNIQUE index, which means that you cannot have duplicate values in that column, or a PRIMARY KEY which in some storage engines defines where in...
Possible to make labels appear when hovering over a point in matplotlib?
...otlib to make scatter plots. Each point on the scatter plot is associated with a named object. I would like to be able to see the name of an object when I hover my cursor over the point on the scatter plot associated with that object. In particular, it would be nice to be able to quickly see the nam...