outlet - an opening that permits escape or release; he blocked the way out; the canyon had only one issue. exit, way out, issue. opening - a vacant or unobstructed space that is man-made; they left a small opening for the cat at the bottom of the door.
Differences between grep, pgrep, egrep, and fgrep (Linux): grep grep is an acronym that stands for Global Regular Expressions Print. grep is a program which scans a specified file or files line by line, returning lines that contain a pattern. A pattern is an expression that specifies a set of strings by interpreting characters as meta-characters.
The fgrep command is case sensitive; specifying dog will not match Dog or DOG. You can use the-i option with the grep command to match both upper-and lowercase letters: To list the lines of myfile that do not contain dog, use the-v option:If you want to search for lines that contain any of several different words, you can create a second file (named secondfile in the following example) that contains those words, and then use the-f option:he general syntax of the grep commands is: You can use fgrep to find all the lines of a file that contain a particular word. For example, to list all the lines of a file named myfile in the current directory that contain the word dog, enter at the Unix prompt: