Changes between Version 12 and Version 13 of cypress/BasicLinuxComands

Timestamp:

08/19/15 17:56:01 (10 years ago)

Author:

cmaggio

Comment:

—

cypress/BasicLinuxComands

@@ -327 +327 @@
 These are just a couple examples of the many ways '''find''' can be used. A nice short tutorial on '''find''' with a lot of examples can be found at http://alvinalexander.com/unix/edu/examples/find.shtml
 
+
+=== Pipe ( | ) ===
+
+The pipe command, '''|''', takes the output of one command and passes it to another. For example we could "pipe" the output of '''cat''' to '''grep''' in order to search a file for a particular string
+
+{{{
+[tulaneID@cypress1 examples]$ cat numbers.txt | grep 1
+01
+10
+[tulaneID@cypress1 examples]$ 
+}}} 
+
+=== history ===
+Displays the command history list with line numbers. You can add an optional integer, n, argument to display only the last n commands
+
+{{{
+[tulaneID@cypress1 examples]$ history 2
+  299  cat numbers.txt | grep 1
+  300  history 2
+[tulaneID@cypress1 examples]$ 
+}}}
+
+Note: '''history''', '''|''', and '''grep''' when used together are a powerful combination as they allow you to search for old commands that you may not remember the exact syntax for:
+
+{{{
+[tulaneID@cypress1 examples]$ history | grep chmod
+  153  chmod u+x myscript.sh 
+  204  chmod +x myexecutable.sh 
+  271  chmod +x myscript.sh 
+  273  chmod -x myscript.sh 
+  301  history | grep chmod
+[tulaneID@cypress1 examples]$ 
+}}}
+
 == Advanced Linux Commands ==