Changes between Version 8 and Version 9 of cypress/BasicLinuxComands

Timestamp:

08/18/15 21:57:56 (9 years ago)

Author:

cmaggio

Comment:

—

cypress/BasicLinuxComands

@@ -183 +183 @@
 == Intermediate Linux Commands ==
 
+=== Star Wildcard ===
+Shell commands can often make use of the wildcard characters. The most universal of these is the asterisk or star wildcard, *. This acts as a stand-in for any and all strings. 
+ 
 === ls again ===
-The behavior of the '''ls''' command can be modified by the addition of option flags. By default '''ls''' does not list any "hidden" files and subdirectories. To display all files and subdirectories one must add the ''-a'' flag.
+Suppose we have a directory containing many files, but we only want to list files ending with the .txt extension. We can use the * wildcard to request a list of any file ending in .txt
+
+{{{
+[tulaneID@cypress1 ~]$ ls
+a.out  NextDirectoryDown helloworld.c  textfile01.txt  textfile02.txt
+[tulaneID@cypress1 ~]$ ls *.txt
+textfile01.txt  textfile02.txt
+[tulaneID@cypress1 ~]$ 
+}}}
+
+Additionally, the behavior of the '''ls''' command can be modified by the addition of option flags. By default '''ls''' does not list any "hidden" files and subdirectories. To display all files and subdirectories one must add the ''-a'' flag.
 
 {{{
 [tulaneID@cypress1 ~]$ ls -l
 total 4
-drwxr-xr-x 2 tuhpc002 workshop 4096 Aug 18 16:17 NextDirectoryDown
+-rw-r--r-- 1 tulaneID workshop    0 Aug 18 21:50 a.out
+drwxr-xr-x 2 tulaneID workshop 4096 Aug 18 21:37 NextDirectoryDown
+-rw-r--r-- 1 tulaneID workshop    0 Aug 18 21:50 helloworld.c
+-rw-r--r-- 1 tulaneID workshop    0 Aug 18 21:50 textfile01.txt
+-rw-r--r-- 1 tulaneID workshop    0 Aug 18 21:50 textfile02.txt
 [tulaneID@cypress1 ~]$ ls -al
 total 56
-drwx------ 6 tuhpc002 workshop 4096 Aug 18 20:03 .
+drwx------ 6 tulaneID workshop 4096 Aug 18 20:03 .
 drwxr-xr-x 5 root     root     4096 Aug 12 13:00 ..
--rw------- 1 tuhpc002 workshop  107 Aug 18 16:59 .bash_history
--rw-r--r-- 1 tuhpc002 workshop   18 Jul 18  2013 .bash_logout
--rw-r--r-- 1 tuhpc002 workshop  176 Jul 18  2013 .bash_profile
--rw-r--r-- 1 tuhpc002 workshop  124 Sep 30  2014 .bashrc
--rw-r--r-- 1 tuhpc002 workshop  500 May  7  2013 .emacs
-drwxr-xr-x 2 tuhpc002 workshop 4096 Nov 11  2010 .gnome2
--rw-r--r-- 1 tuhpc002 workshop  171 Aug  6  2014 .kshrc
-drwxr-xr-x 4 tuhpc002 workshop 4096 Aug  6  2014 .mozilla
-drwxr-xr-x 2 tuhpc002 workshop 4096 Aug 18 16:17 NextDirectoryDown
-drwx------ 2 tuhpc002 workshop 4096 Aug 13 16:18 .ssh
--rw------- 1 tuhpc002 workshop 1786 Aug 18 20:03 .viminfo
--rw------- 1 tuhpc002 workshop   54 Aug 13 16:18 .Xauthority
+-rw------- 1 tulaneID workshop  107 Aug 18 16:59 .bash_history
+-rw-r--r-- 1 tulaneID workshop   18 Jul 18  2013 .bash_logout
+-rw-r--r-- 1 tulaneID workshop  176 Jul 18  2013 .bash_profile
+-rw-r--r-- 1 tulaneID workshop  124 Sep 30  2014 .bashrc
+-rw-r--r-- 1 tulaneID workshop  500 May  7  2013 .emacs
+drwxr-xr-x 2 tulaneID workshop 4096 Nov 11  2010 .gnome2
+-rw-r--r-- 1 tulaneID workshop  171 Aug  6  2014 .kshrc
+drwxr-xr-x 4 tulaneID workshop 4096 Aug  6  2014 .mozilla
+drwxr-xr-x 2 tulaneID workshop 4096 Aug 18 16:17 NextDirectoryDown
+drwx------ 2 tulaneID workshop 4096 Aug 13 16:18 .ssh
+-rw------- 1 tulaneID workshop 1786 Aug 18 20:03 .viminfo
+-rw------- 1 tulaneID workshop   54 Aug 13 16:18 .Xauthority
 [tulaneID@cypress1 ~]$ 
 }}}