What are the metacharacters in Unix? Metacharacters are special characters that are used to represent something other than themselves . As a rule of thumb, characters that are neither letters nor numbers may be metacharacters. Like grep , sed , and awk , the shell has its own set of metacharacters, often called shell wildcards .
What are metacharacters in bash? A metacharacter is a space , tab , newline , or one of the following characters: ‘ | ‘, ‘ & ‘, ‘ ; ‘, ‘ ( ‘, ‘ ) ‘, ‘ < ‘, or ‘ > ‘. A word consisting solely of letters, numbers, and underscores, and beginning with a letter or underscore. Name s are used as shell variable and function names.
What are the various types of shell metacharacters?
- Shell metacharacters on Linux. You can extend each of those commands through the use of metacharacters.
- Pipe | Say that I want to know all the instances of Firefox running on my system.
- Output redirection > Another favorite metacharacter is the output redirection > .
- Asterisk *
- Tilde ~
- Dollar symbol $
- Caret ^
Which metacharacter is used to run a process in the background in Linux?
|&||Run command in the background, Background Processes|
|$||Expand the value of a variable|
|Prevent or escape interpretation of the next character|