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 …

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 …

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 …

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...

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 …

Nov 9, 2012 · I have two directories with the same list of files. I need to compare all the files present in both the directories using the diff command. Is there a simple command line option …

Oct 30, 2008 · A Unix tick is 1 second (if I remember well), and a .NET tick is 100 nanoseconds. If you've been encountering problems with nanoseconds, you might want to try using AddTick …

I am trying to figure out what is the usage of this command: echo < a.txt According to text book it should redirect a programs standards input. Now I am redirecting a.txt to echo but instead of

Jul 20, 2012 · 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 …

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