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  1. 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 …

  2. 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 …

  3. unix - How to check permissions of a specific directory ... - Stack ...

    I know that using ls -l "directory/directory/filename" tells me the permissions of a file. How do I do the same on a directory? I could obviously use ls -l on the directory higher in the hierarchy...

  4. How to convert DOS/Windows newline (CRLF) to Unix newline (LF)

    Apr 10, 2010 · How can I programmatically (not using vi) convert DOS/Windows newlines to Unix newlines? The dos2unix and unix2dos commands are not available on certain systems. How …

  5. unix - how to find host name from IP with out login to the host

    Oct 20, 2014 · i need to find the host name of a UNIX host whose IP is known with out login to that UNIX host

  6. 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 …

  7. unix - How to get PID of process by specifying process name and …

    Jul 3, 2013 · a way to avoid the "grep -v grep" is to use "grep <process nam [e]>" so it interpolates the string and the process nam [e] isn't found when the first grep executes, if that makes sense.

  8. www.opengroup.org

    About Us The Open Group is a global consortium that enables the achievement of business objectives through technology standards and open source initiatives by fostering a culture of …

  9. 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 …

  10. unix - Why should text files end with a newline? - Stack Overflow

    Apr 8, 2009 · I assume everyone here is familiar with the adage that all text files should end with a newline. I've known of this "rule" for years but I've always wondered — why?