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linux - Explaining the find -mtime command - Stack Overflow The POSIX specification for find says:-mtimen The primary shall evaluate as true if the file modification time subtracted from the initialization time, divided by 86400 (with any remainder discarded), is n
What are the special dollar sign shell variables? 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
The UNIX® Standard | www. opengroup. org 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
unix - What is the meaning of POSIX? - Stack Overflow 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 operating systems without modification The POSIX standard defines a set of system calls, libraries, and utilities that are commonly found in UNIX-based operating systems
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 all the other typical features of mailx Unfortunately, it does not fit on a single line
In Unix, how do you remove everything in the current directory and . . . First, if you look at the rm command man page (man rm under most Unix) you notice that –r means "remove the contents of directories recursively" So, doing rm -r alone would delete everything in the current directory and everything bellow it
Are there any standard exit status codes in Linux? 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 Poco::Util::Application, ExitCode A signal 11 is a SIGSEGV (segment violation) signal, which is different from a return code