Shell comprehensive application cases, archive files

1. The archive

In practical production application , It is often necessary to archive and back up important data .
demand : Implement a script that archives and backs up the specified directory every day , Enter a directory name ( It doesn't end with /), Archive and save all files in the directory on a daily basis , And attach the filing date to the file name , Put it in /root/archive Next .
The archive command is used here : tar
You can add -c Option means archive , add -z Option means to compress at the same time , The resulting file suffix is .tar.gz

1.1 Script implementation

#!/bin/bash

# First, judge whether the number of input parameters is 1
if [ $# -ne 1 ]
then
        echo " Wrong number of parameters ！ You should enter a parameter , As the archive directory name "
        exit
fi

#  Get the directory name from the parameter 
if [ -d $1 ]
then
        echo
else
        echo
        echo " directory does not exist ！"
        echo
        exit
fi

DIR_NAME=$(basename $1)
DIR_PATH=$(cd $(dirname $1); pwd)

#  Get current date 
FILE=archive_${
    DIR_NAME}_$DATE.tar.gz
DEST=/root/archive/$FILE

#  Start archiving catalog files 

echo " Start filing ..."
echo

tar -czf $DEST $DIR_PATH/$DIR_NAME

if [ $? -eq 0 ]
then
        echo
        echo " Archive success ！"
        echo " Archive file is ：$DEST"
        echo
else
        echo " There is a problem with archiving !"
        echo
fi

exit

1.2 test

Then create a file

Archive success

1.3 Regular filing

Use crontab
crontab The code in

0 2 * * * /root/scripts/daily_archive.sh /root/scripts