Shell Tips - Revision history

Mad ady at 09:14, 18 March 2012

2012-03-18T09:14:39Z

Mad ady: Added commands for history persistance

2012-03-18T09:13:07Z

Added commands for history persistance

Mad ady: Added prompt customization

2012-03-18T08:51:41Z

Added prompt customization

Odoggy at 14:01, 4 September 2010

2010-09-04T14:01:25Z

Odoggy at 14:00, 4 September 2010

2010-09-04T14:00:14Z

@@ Line 115: / Line 115: @@
 =Keeping a persistent history=
-By default, on reboot you loose the shell history. If you want to keep it accross reboots, you will need to save the history file (/tmp/.ash_history) on a persistent storage (e.g. USB drive). You will restore the file from USB on startup, and save it back to the storage on shutdown. You will first need to know the complete path to your USB drive - this can be found from the webend, or through telnet. For example I will use here ''/tmp/mnt/6c67aa8a-e447-4f27-be88-150f6f42fceb/''
+By default, on reboot you loose the shell history. If you want to keep it accross reboots, you will need to save the history file ('''/tmp/.ash_history''') on a persistent storage (e.g. USB drive). You will restore the file from USB on startup, and save it back to the storage on shutdown. You will first need to know the complete path to your USB drive - this can be found from the webend, or through telnet. For example I will use here ''/tmp/mnt/6c67aa8a-e447-4f27-be88-150f6f42fceb/''
 * To save the file on the USB on power off, use a custom power off command:
   config_tool -c POWER_DOWN_ACTION10='cp /tmp/.ash_history "/tmp/mnt/6c67aa8a-e447-4f27-be88-150f6f42fceb/.ash_history"'
-* To restore the file on startup, add a command to your S99user-script:
+* To restore the file on startup, add a command to your [[S99user-script]]:
   #!/bin/sh
   cp "/tmp/mnt/6c67aa8a-e447-4f27-be88-150f6f42fceb/.ash_history" /tmp
 Make sure everything is saved by running '''config_tool -s''' afterwards.

← Older revision		Revision as of 09:13, 18 March 2012
Line 115:		Line 115:

	=Keeping a persistent history=		=Keeping a persistent history=
		+	By default, on reboot you loose the shell history. If you want to keep it accross reboots, you will need to save the history file (/tmp/.ash_history) on a persistent storage (e.g. USB drive). You will restore the file from USB on startup, and save it back to the storage on shutdown. You will first need to know the complete path to your USB drive - this can be found from the webend, or through telnet. For example I will use here ''/tmp/mnt/6c67aa8a-e447-4f27-be88-150f6f42fceb/''
		+	* To save the file on the USB on power off, use a custom power off command:
		+	config_tool -c POWER_DOWN_ACTION10='cp /tmp/.ash_history "/tmp/mnt/6c67aa8a-e447-4f27-be88-150f6f42fceb/.ash_history"'
		+	* To restore the file on startup, add a command to your S99user-script:
		+	#!/bin/sh
		+	cp "/tmp/mnt/6c67aa8a-e447-4f27-be88-150f6f42fceb/.ash_history" /tmp
		+	Make sure everything is saved by running '''config_tool -s''' afterwards.

← Older revision		Revision as of 08:51, 18 March 2012
Line 105:		Line 105:
	netstat -an \|grep :80 \|wc -l		netstat -an \|grep :80 \|wc -l
	Show how many active connections there are to a webserver (lighthttpd runs on port 80)		Show how many active connections there are to a webserver (lighthttpd runs on port 80)
		+
		+	=Customizing the shell prompt on the WDTV=
		+	The default shell prompt for the wdtv is '''#'''. This differs from the standard linux prompt, which is usually in the form ''user@host:/path$''. If you want to have this sort of prompt when you log in, you will need to alter the PS1 system variable. For instance, for my system this is the PS1 variable:
		+	root@Deneb:/root# echo $PS1
		+	`whoami`@`hostname`:`pwd`#
		+	To make the changes persistent accross reboots, add this command to '''/conf/profile''' (create the file if it doesn't exist):
		+	PS1='`whoami`@`hostname`:`pwd`# '
		+	Now, on new logins you should be presented with a better shell prompt. Other shell customization can go there as well (e.g. aliases)
		+
		+	=Keeping a persistent history=

@@ Line 57: / Line 57: @@
 : '''rm -f filename.txt''' : deletes filename.txt, will not ask for confirmation before deleting.
 : '''rm -rf mydir/''' : recursively deletes the directory tmp, and all files in it, including subdirectories. '''BE VERY CAREFULL WITH THIS COMMAND!!!'''
-* '''mkdir''' : short for make directory. Is used to make a directory.
+* '''mkdir''' : short for make directory. Is used to make a new directory.
 * '''kill''' : terminate a system process, usage: kill PID. Use top or ps to get system PIDs (Process IDs)
 : '''''kill 10550''' : will terminate process with ID 10550''

@@ Line 57: / Line 57: @@
 : '''rm -f filename.txt''' : deletes filename.txt, will not ask for confirmation before deleting.
 : '''rm -rf mydir/''' : recursively deletes the directory tmp, and all files in it, including subdirectories. '''BE VERY CAREFULL WITH THIS COMMAND!!!'''
+* '''mkdir''' : short for make directory. Is used to make a directory.
 * '''kill''' : terminate a system process, usage: kill PID. Use top or ps to get system PIDs (Process IDs)
 : '''''kill 10550''' : will terminate process with ID 10550''
 * '''ARCHIVES''' : Creating and Extracting '''.tar.gz, .tar and .zip''' files
 : '''tar -zxvf file.tar.gz''' : Extracts the file