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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 are the special dollar sign shell variables? - Stack Overflow
In Bash, there appear to be several variables which hold special, consistently-meaning values For instance, myprogram amp;; echo $! will return the PID of the process which backgrounded myprog
- What does the line #! bin sh mean in a UNIX shell script?
55 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 #! corresponds to the magic number 0x2321 (look it up in an ascii table)
- 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 collaboration, inclusivity, and mutual respect among our diverse group of 900+ memberships Our Membership includes customers, systems and solutions suppliers, tool vendors, integrators, academics, and consultants
- 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
- unix - How to kill a process running on particular port in Linux . . .
To list any process listening to the port 8080: lsof -i:8080 To kill any process listening to the port 8080: kill $(lsof -t -i:8080) or more violently: kill -9 $(lsof -t -i:8080) (-9 corresponds to the SIGKILL - terminate immediately hard kill signal: see List of Kill Signals and What is the purpose of the -9 option in the kill command? If no signal is specified to kill, the TERM signal a k a
- bash - Shell equality operators (=, ==, -eq) - Stack Overflow
It depends on the Test Construct around the operator Your options are double parentheses, double brackets, single brackets, or test If you use ((…)), you are testing arithmetic equality with == as in C: $ (( 1==1 )); echo $? 0 $ (( 1==2 )); echo $? 1 (Note: 0 means true in the Unix sense and a failed test results in a non-zero number ) Using -eq inside of double parentheses is a syntax
- unix - How to attach a file using mail command on Linux . . . - Stack . . .
I'm on a server running a Linux shell I need to mail a simple file to a recipient How to do this, prefereably using only the mail command?
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