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 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 …

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 3, 2013 · a way to avoid the "grep -v grep" is to use "grep <process nam [e]>" so it interpolates the string and the process nam [e] isn't found when the first grep executes, if that makes sense.

May 5, 2011 · How can I recursively find all files in current and subfolders based on wildcard matching?

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 …

Jun 6, 2013 · How do I find all files containing a specific string of text within their file contents? The following doesn't work. It seems to display every single file in the system. find / -type f …