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1) back up the specified file

[root@iZ2vc5lqzt23aweti4j777Z 15thOctober2024]# cat test1.sh 
suffix=` date +%Y%m%d`for f in `find /root/15thOctober2024/data/ -type f -name '*.txt'`doecho 'backup file $f'cp ${f} ${f}_${suffix}
done[root@iZ2vc5lqzt23aweti4j777Z 15thOctober2024]# ls -al
total 16
drwxr-xr-x   3 root root 4096 Oct 15 17:48 .
dr-xr-x---. 14 root root 4096 Oct 15 17:48 ..
drwxr-xr-x   2 root root 4096 Oct 15 17:48 data
-rw-r--r--   1 root root  147 Oct 15 17:48 test1.sh[root@iZ2vc5lqzt23aweti4j777Z 15thOctober2024]# bash test1.sh 
backup file $f
[root@iZ2vc5lqzt23aweti4j777Z 15thOctober2024]# ls -al /root/15thOctober2024/data
total 16
drwxr-xr-x 2 root root 4096 Oct 15 17:48 .
drwxr-xr-x 3 root root 4096 Oct 15 17:48 ..
-rw-r--r-- 1 root root   25 Oct 15 17:38 test1.txt
-rw-r--r-- 1 root root   25 Oct 15 17:48 test1.txt_20241015