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How do I tell if a regular file does not exist in Bash?

I've used the following script to see if a file exists: 20 Answers 20 ...
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Command not found when using sudo

I have a script called foo.sh in my home folder. 9 Answers 9 ...
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An example of how to use getopts in bash

I want to call myscript file in this way: 7 Answers 7 ...
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Python - write() versus writelines() and concatenated strings

So I'm learning Python. I am going through the lessons and ran into a problem where I had to condense a great many target.write() into a single write() , while having a "\n" between each user input variable(the object of write() ). ...
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How can I remove specific rules from iptables?

I am hosting special HTTP and HTTPS services on the ports 8006 and 8007 respectively. I use iptables to "activate" the server; i.e. to route the incoming HTTP and HTTPS ports: ...
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Setting environment variables on OS X

What is the proper way to modify environment variables like PATH in OS X? 31 Answers ...
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Portable way to get file size (in bytes) in shell?

On Linux, I use stat --format="%s" FILE , but Solaris I have access to doesn't have stat command. What should I use then? ...
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How does SIGINT relate to the other termination signals such as SIGTERM, SIGQUIT and SIGKILL?

On POSIX systems, termination signals usually have the following order (according to many MAN pages and the POSIX Spec): 6 ...
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How do I get a substring of a string in Python?

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Tricky Google interview question

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