I have a book that says that the output of the command echo * is the line that follows below. I can't find why it outputs that. Please help.
$ echo *
local.cshrc local.login local.profile
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2Bash globbing and filename expansionGeorge Vasiliou– George Vasiliou2017-03-18 10:58:43 +00:00Commented Mar 18, 2017 at 10:58
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2 Answers
* is shell special character (glob match) that matches the names of files and directories in the current directory.
$ ls *
This will list all files and directories in current directory. So, in your case '*' returns and 'echo' prints them on the console. Try this to confirm:
$ x=*
$ echo $x
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ls *is slightly different fromecho *;mkdir p; touch p/j2017-03-18 14:43:19 +00:00Commented Mar 18, 2017 at 14:43 -
Agree. ls * will also display the content of first level subdirectories.Sharad– Sharad2017-03-18 17:42:19 +00:00Commented Mar 18, 2017 at 17:42
You are using a wildcard - * which is used with globbing and file-expansion.
The referenced link above describes this further:
Standard wildcards (also known as globbing patterns) are used by various command-line utilities to work with multiple files. For more information on standard wildcards (globbing patterns) refer to the manual page by typing:
and
*(asterisk) this can represent any number of characters (including zero, in other words, zero or more characters). If you specified a "cd*" it would use "cda", "cdrom", "cdrecord" and anything that starts with “cd” also including “cd” itself. "m*l" could by mill, mull, ml, and anything that starts with an m and ends with an l.
