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How to make “if not true condition”?
I would like to have the echo command executed when cat /etc/passwd | grep "sysa" is not true.
6 Answers
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How do I programmatically “restart” an Android app?
Firstly, I know that one should not really kill/restart an application on Android. In my use case I want to factory-reset my application in a specific case where a server sends a specific information to the client.
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Diagnosing Memory Leaks - Allowed memory size of # bytes exhausted
...memory. Thus, the most common source of memory leaks are cyclic references and global variables. If you use a framework, you'll have a lot of code to trawl through to find it, I'm afraid. The simplest instrument is to selectively place calls to memory_get_usage and narrow it down to where the code l...
How to get certain commit from GitHub project
... Next, change into the newly cloned repository:
cd facebook-ios-sdk
... and use git checkout <COMMIT> to change to the right commit:
git checkout 91f25642453
That will give you a warning, since you're no longer on a branch, and have switched directly to a particular version. (This is kn...
What's the point of malloc(0)?
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The C standard (C17 7.22.3/1) says:
If the size of the space requested is zero, the behavior is implementation defined:
either a null pointer is returned, or the behavior is as if the size were some
nonzero value, except that...
Python List vs. Array - when to use?
...y, you can implement it as a List, or else use the 'array' module in the standard library. I have always used Lists for 1d arrays.
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SQL-Server: Is there a SQL script that I can use to determine the progress of a SQL Server backup or
...t Studio, I get a visual indication of how far the process has progressed, and thus how much longer I still need to wait for it to finish. If I kick off the backup or restore with a script, is there a way to monitor the progress, or do I just sit back and wait for it to finish (hoping that nothing h...
Defining a variable with or without export
...l process. If you want a process to make use of this variable, use export, and run the process from that shell.
name=value
means the variable scope is restricted to the shell, and is not available to any other process. You would use this for (say) loop variables, temporary variables etc.
It's im...
How to create an array from a CSV file using PHP and the fgetcsv function
...here in case fopen() fails, but this works to read a CSV file line by line and parse the line into an array.
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When should I use Struct vs. OpenStruct?
In general, what are the advantages and disadvantages of using an OpenStruct as compared to a Struct? What type of general use-cases would fit each of these?
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