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 …
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?
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 …
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", …
Newest 'unix' Questions - Stack Overflow
Apr 10, 2019 · Currently there is a unix-based system that exposes a file in what the team is saying would be {{parameters.secret-path}}/file. I am not sure how to read that in java given the enclosing of …
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 …
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, 9 months ago Modified 3 years, 9 months ago Viewed 357k times
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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...
Difference between CR LF, LF and CR line break types
Oct 12, 2009 · I'd like to know the difference (with examples if possible) between CR LF (Windows), LF (Unix) and CR (Macintosh) line break types.