Linux commands (constantly updating ......)

Lsof

Http://www.cnblogs.com/rootq/articles/1401850.html

Free

Http://www.cnblogs.com/chenrj/archive/2009/02/06/1385183.html

VI

Http://www.cnblogs.com/chenrj/archive/2008/08/28/1278893.html

2> & 1

The file descriptor is generally stdin, stdout, stderr, that is, 0, 1, 2.
Redirect the standard error output>, place it in the place where the standard output is located through the Background &

WC

Calculated words:
-C or -- bytes or -- chars only displays the number of bytes.
-L or -- lines only displays the number of columns.
-W or -- words only show words.
Rpm

Http://www.linuxsir.org/main? Q = node/50

Export & setenv

Set Environment Variables
Export is used by SH and KSh shells.
Setenv is used by CSH.
The syntax also differs for both.
Code:
Export key = Value
Setenv key value

Watch

Periodically execute a command and dynamically update the display in full screen. Parameters:
-D, -- differences [= cumulative] highlight changes
-N, -- interval = Cycle (SEC)
For example:
1) view network port traffic:
Watch-N 1 "/sbin/ifconfig eth0 | grep bytes"
2) view network TCP connections:
Watch-N 1-D netstat-ant

Vmstat

Http://www.cnblogs.com/bianxq/archive/2009/04/15/1436413.html

Top

Http://blog.csdn.net/sanshiqiduer/archive/2007/12/13/1933625.aspx