The UNIX® Standard | www.opengroup.org
May 22, 2025 · 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 …
linux - Explaining the 'find -mtime' command - Stack Overflow
Aug 27, 2014 · obscure Unix find command syntax understanding. 0. Specific Linux find command. 4.
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 $! will return the PID of the process …
What does the line "#!/bin/sh" mean in a UNIX shell script?
Sep 10, 2011 · When you try to execute a program in unix (one with the executable bit set), the operating system will look at the first few bytes of the file. These form the so-called "magic …
bash - Shell equality operators (=, ==, -eq) - Stack Overflow
unix bash shell script equal comparison operator is not comparing. 1. Equal and not equal operators not ...
unix - How to check permissions of a specific directory ... - Stack ...
In GNU/Linux, try to use ls, namei, getfacl, stat.. For Dir [flying@lempstacker ~]$ ls -ldh /tmp drwxrwxrwt. 23 root root 4.0K Nov 8 15:41 /tmp [flying@lempstacker ~]$ namei -l /tmp f: /tmp …
unix - What is the meaning of "POSIX"? - Stack Overflow
Nov 23, 2009 · POSIX is similar to the UNIX standard, and it is intended to ensure that software written for one POSIX-compliant operating system can run on other POSIX-compliant …
unix - How to get PID of process by specifying process name and …
Jul 3, 2013 · Solution (Exact Process Name Match) pgrep -x <process_name> | xargs kill -9 (incidentally, for this specific use case, might as well do pkill -9 -x <process_name>, but the …
unix - How to attach a file using mail command on Linux ... - Stack ...
The following is a decent solution across Unix/Linux installations, that does not rely on any unusual program features. This supports a multi-line message body, multiple attachments, and …
Are there any standard exit status codes in Linux?
Jul 9, 2009 · Standard Unix exit codes are defined by sysexits.h, as David mentioned. The same exit codes are used by portable libraries such as Poco - here is a list of them: Class …