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  1. The UNIX® Standard | www.opengroup.org

    May 22, 2025 · 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 …

  2. What does the line "#!/bin/sh" mean in a UNIX shell script?

    Sep 10, 2011 · 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", …

  3. Newest 'unix' Questions - Stack Overflow

    Apr 10, 2019 · Check if directory exists on a unix server, if not create and move files to, using C# [closed] If had a look but can't find much nformation on how to check if a directory exists on a unix …

  4. How to check if $? is not equal to zero in unix shell scripting?

    How to check if $? is not equal to zero in unix shell scripting? Asked 12 years, 10 months ago Modified 3 years, 10 months ago Viewed 357k times

  5. unix - what does '$?' mean in a shell script? - Stack Overflow

    Oct 5, 2012 · I came across a shell script that contains a statement like, if [ $val -eq $? ] What does $? mean here?

  6. linux - What does $@ mean in a shell script? - Stack Overflow

    Apr 3, 2012 · What does a dollar sign followed by an at-sign (@) mean in a shell script? For example: umbrella_corp_options $@

  7. UNIX® Systems | www.opengroup.org

    This is an opportunity for leading UNIX system suppliers suppliers to acquire state-of-the-art test tools to ensure the development of conformant UNIX® System products and to demonstrate their …

  8. unix - What is the meaning of "POSIX"? - Stack Overflow

    Nov 23, 2009 · 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 …

  9. Cannot connect to the Docker daemon at unix:///var/run/docker.sock.

    open cmd and run docker version. Does both the client and server show or is there an error?

  10. What are the special dollar sign shell variables? - Stack Overflow

    Sep 14, 2012 · In Bash, there appear to be several variables which hold special, consistently-meaning values. For instance, ./myprogram &; echo $! will return the PID of the process which …