Frequently Using Linux Commands

How to check Port availability 

lsof -i tcp:<Port_Num>

Netstat -putan |grep <Port_Number>

netstat -an |grep <Port_Number>

 

lsof -i tcp:8031 

netstat -putan |grep 8031

 

Renaming more than one characters in VI editor

 

Below command is replacing the word "DEV" to TEST in source file

 

perl -pi -e 's/DEV/TEST/g' <File_Name>

 

Ex: perl -pi -e 's/DEV/TEST/g' initTEST.ora  

 

Check the Connection issues

 

nslookup  <Hostname>

tnsping <Hosyname>

 

Searching the Multiple parameters in single file

 

$ORACLE_HOME/OPatche/opatch lsinventory |egrep -w '23456|125679|76578'| grep "applied on"

 

Tar Command

Tar command is using to zip and unzip the files 

Zip files:

tar -cvf 11.2.0.4.tar.gz 11.2.0.4/

Unzip

tar -xvzf 11.2.0.4.tar.gz

 

Nohup command

nohup command in Linux systems that keep processes running even after exiting the shell or terminal.

nohup tar -cvf 11.2.0.4.tar.gz 11.2.0.4/  &

Monitoring nohup process

jobs -l

How to delete huge files

 

Ex:-  Some files consuming more space we need to remove old file use below commands

 

find . -type f -mtime +5

find . -type f -mtime +5 -exec rm -vf {} \;

 

O/P

 

removed ‘./l1104704913.req’

removed ‘./l1104701655.req’

removed ‘./l1104705584.req’

 

How to move old file to other folders

 

Mtime +4 means after 4 days files only move to below mentioned folders

 

find . -type f -mtime +4

 

find . -type f -mtime +4 -exec mv {} /sanjeev/ebs/XDO_BKP/ \;

 

Find Top consuming space files

 

[applmgr@ebsvis log]$ du -sh *|sort -rh | head -n 5

133G    l6805177.req

104G    l6805159.req

37G     l6802151.req

36G     l6805766.req

35G     l6806182.req