session-13.txt

How do you call other scripts from your shell script?
-------------------------------------------
2 ways

1st way
------------
./<script-name>.sh

variable values will not change after calling other script..
PID of two scripts are different

1. changes happened in other script will not affect current script
2. PID of 2 scripts are different

2nd way
-------------
source ./<script-name>.sh
variable values changes after calling other script
PID of 2 scripts are same...

1. changes happened in other script will be reflected in current script
2. PID of2 scripts are same.

disadvantage
-------------
script will not exit even error comes...

set -e --> script starting

some cases --> even error comes, it should move forward --> error handling


delete old logs
---------------
cd /app/logs
	daily 1 log file

delete old log files more than 2 weeks old...

1. decide which folder, check that folder exist or not
2. .java, .sh, .py, .log files are there in that folder
3. find only .log files
4. find only more than 2 weeks old

while read line; do  
  ARRAY[$c]="$line"
  c=$((c+1))  
done < <(tcpdump -n -r "$pcap")

while IFS= read -r line
do
	statements to execute
done <<< input