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The UNIX® Standard | www. opengroup. org Single UNIX Specification- “The Standard” The Single UNIX Specification is the standard in which the core interfaces of a UNIX OS are measured The UNIX standard includes a rich feature set, and its core volumes are simultaneously the IEEE Portable Operating System Interface (POSIX) standard and the ISO IEC 9945 standard
What does the line #! bin sh mean in a UNIX shell script? When you try to execute a program in unix (one with the executable bit set), the operating system will look at the first few bytes of the file These form the so-called "magic number", which can be used to decide the format of the program and how to execute it
bash - Shell equality operators (=, ==, -eq) - Stack Overflow = and == are for string comparisons -eq is for numeric comparisons -eq is in the same family as -lt, -le, -gt, -ge, and -ne == is specific to bash (not present in sh (Bourne shell), ) Using POSIX = is preferred for compatibility In bash the two are equivalent, and in sh = is the only one that will work
What do $? $0 $1 $2 mean in a shell script? - Stack Overflow I often come across $?, $0, $1, $2, etc in shell scripting I know that $? returns the exit status of the last command: echo quot;this will return 0 quot; echo $? But what do the others do? What
unix - What is the meaning of POSIX? - Stack Overflow Since every Unix does things a little differently -- Solaris, Mac OS X, IRIX, BSD, and Linux all have their quirks -- POSIX is especially useful to those in the industry as it defines a standard environment to operate in
How can I generate Unix timestamps? - Stack Overflow Related question is "Datetime To Unix timestamp", but this question is more general I need Unix timestamps to solve my last question My interests are Python, Ruby and Haskell, but other approac
What is the proper way to exit a command line program? 2 Take a look at Job Control on UNIX systems If you don't have control of your shell, simply hitting ctrl + C should stop the process If that doesn't work, you can try ctrl + Z and using the jobs and kill -9 %<job #> to kill it The '-9' is a type of signal You can man kill to see a list of signals