Linux

 

command --help

 

man command

 

man ping        call manual of ping program

 

man -k ping    which keys available in the ping command

 

!xx                   repeat last xxyyzz command

 

ctrl + r             search command in the history

 

 

Oracle

 

export NLS_LANG=AMERICAN_RUSSIA.AL32UTF8          read Russian errors

 

 

iTerm2 Download it for Mac from external page

 

shift + cmd + h        Buffer

symbol, cmd + ;      Symblol buffer

alt + space               Hotkey window

 

 

! Before any Server Reboot !

 

1. OPEN SERVER’S CONSOLE (VMware, KVM via WEB, iLO) to check boot messages

 

2. Also check disk parameter in the /etc/fstab 0 0         dump 0 pass 0 to decrease boot time
a) dump, used by the dump utility to decode when to make a backup. If 0 dump will ignore the file system
b) pass, 0 not to check filesystem; 1 to check with highest priority (for root); 2 to check all other filesystems 

 

3. Find startup command in the history in all users history

 

as root

su - someuser         ls /home

 

history | grep start

history | grep .sh

history 100

 

4. Check routes

 

ifconfig                        chk external interface

netstat -nr                   chk routes

 

history | grep route    note, how to add route