Patch Administration

Patch:
A patch is a collection of specified package which especially used to upgrade the system and establish a communication link between the existing application & the new application.
- we can download the patch from the internet and it will be always in 'zip' format.
- we need to unzip it and extract it.
- every patch comes along with batch ID
ex: 118893 -14          //it is called batch id, 118893 is a patch id and 14 is a version
- where the 1st part of the batch id is patch id & 2nd part is version
- by default, if want to add a patch, the patch should be kept at the location called
   /var/spool/patch
- but the patch directory doesn't exist, we need to create it
  # cd /var/spool

1. # cd /var/spool
2. # mkdir patch
3. # cd patch
4. insert patch cd
   # df -h                  // it displays the cd mounted
  # cd /cdrom/cdrom0
  # ls
  # cd patch_
  # ls
  (118833_3.zip, 119963_1.zip)            // 3- 3 files, 1-1 file
 
to copy the patch from 'cdrom' to required location
#cp -r 119963_1.zip /var/spool/patch

check:
 # cd /var/spool/patch
 # ls
  119963_1.zip              (it should be there)

unzip the file:
 # unzip 119963_1.zip
 # ls
   119963-14               119963-1.zip

Add a patch:
1. #pwd
   /var/spool/patch           (go to the file where the patch file)

2. # cd 119963-14
3. # pwd
   /var/spool/patch/119963-14
4. # patchadd /var/spool/patch/119963-14

to remove the path:  
# patchrm 119963-14