스크립트 이해[닫기]

나는 이것을 이해해야 합니다:

df -ah >/opt/pub/software/tmp/Active_directory.txt
find . -type f  -exec ls -l {} \; | sort -nr -k 5  >>/opt/pub/software/tmp/Active_directory.txt&id=$!

#!/bin/bash
#recolecta.sh
date;echo 'Command is running, it will cost about 10 minutes, please wait...'
cd /opt/
df -ah >/opt/pub/software/tmp/Active_directory.txt
find . -type f  -exec ls -l {} \; | sort -nr -k 5  >>/opt/pub/software/tmp/Active_directory.txt&
id=$!
char=("-" "/" "|" "\\") 
n=0 
while ps -ef |grep "$id" |grep -v grep > /dev/null 
do
       echo -ne "\rCommand is running, it will cost about 10 minutes, please wait...${char[$n]} " 
        n=$(( (n+1)%4 )) 
        sleep 1 
done
ls -lht -R >>/opt/pub/software/tmp/Active_directory.txt
tree >>/opt/pub/software/tmp/Active_directory.txt
REMOTE_HOST=$(getOMUName|grep REMOTE_HOST|awk -F '='  '{print $2}')
ssh $REMOTE_HOST