[SOLVED] Bash script help Hi, all. I'm in the midst of creating a bash script to archive certain directories to a NAS device. I'm not a great script writer, and would appreciate your help. Here's what I have, so far: #!/bin/bash FILENAME="backup"`date -d "last month" +%Y%m`".txt" touch $FILENAME touch --date "2012-06-01" /tmp/start touch --date "2012-06-30" /tmp/end find /data/nightly_data_backup -type d -newer /tmp/start -not -newer /tmp/end -print | sort > $FILENAME mount -t nfs netdisk219:/mnt//vol001/volume02/Archive/Database /backup tar -czvf /backup/2012_04.tar.gz --files-from $FILENAME How can I use variables to substitute in the dates in the commands: touch --date "2012-06-01" /tmp/start touch --date "2012-06-30" /tmp/end The dates should be the begin and end dates of the preceding month from the date I run the script, and: tar -czvf /backup/2012_04.tar.gz --files-from $FILENAME The name of the tar file should also be the preceding month, in the format shown above. Many thanks. Diggy
I'm trying to learn bash scripting , so will this work for you ? Code: #!/bin/bash ##Current day in numeric format i.e 31 day=$(date +%d) ##Current month in numeric format i.e 12 month=$(date +%m) ##Current year in 4 digit format i.e 2012 year=$(date +%Y) ##Last month in numeric format lmonth=$(date -d "last month" +%m) ##Number of days in previous month lday=`cal $lmonth $year | egrep -v [a-z] | wc -w` FILENAME=backup-$(date -d "last month" +%Y-%m).txt touch $FILENAME touch --date "$year-$lmonth-01" /tmp/start touch --date "$year-$lmonth-$lday" /tmp/end mount -t nfs netdisk219:/mnt//vol001/volume02/Archive/Database /backup find /data/nightly_data_backup -type d -newer /tmp/start -not -newer /tmp/end -print | sort > $FILENAME tar -czvf /backup/$year"_"$lmonth".tar.gz" --files-from $FILENAME
TITex, Thanks for your response. I can test what you wrote, but here's what I came up with, and it works: #!/bin/bash #first day of previous month FIRST_DAY=`date -d "-1 month -$(($(date +"%d")-1)) days" +"%b%e"` #first day of this month LAST_DAY=`date -d "-0 month -$(($(date +"%d")-1)) days" +"%b%e"` #name file to be used by tar FILENAME="backup"`date --date="last month" +%Y%m`".txt" #date part of tar file name FILEDATE=`date --date="last month" +%Y_%m` #create file to be used by tar touch $FILENAME #create start and end dates of backup directories to be tarred touch --date "$FIRST_DAY" /tmp/start touch --date "$LAST_DAY" /tmp/end #identify the directories to be tarred and add them to the file to be used by tar find /data/nightly_data_backup -type d -newer /tmp/start -not -newer /tmp/end -print | sort > $FILENAME #start portmap service service portmap start #open connection to NAS mount -t nfs netdisk219:/mnt//vol001/volume02/Archive/Database /backup #back up the database directories to NAS tar -czf /backup/$FILEDATE".tar.gz" --files-from $FILENAME #close connection to NAS umount /backup #stop portmap service service portmap stop #clean up rm -f /tmp/start /tmp/end rm -f /root/$FILENAME The script runs on a CentOS 6.2 system. More elegant solutions might be available but, as I mentioned, it works. I'll test it again next month and, if it still works as expected, I'll create a monthly cron job to run it. Hope it helps with your learning. Diggy
I'm not quite following what you try to backup when.... However I made a few adjustements to your script. Quote whatever you can and for variables you can use ${var} which makes it simpler in quotes to seperate it from other text. Code: #!/bin/bash #first day of previous month FIRST_DAY=`date -d "-1 month -$(($(date +"%d")-1)) days" +"%b%e"` #first day of this month LAST_DAY=`date -d "-0 month -$(($(date +"%d")-1)) days" +"%b%e"` #name file to be used by tar FILENAME="backup"`date --date="last month" +%Y%m`".txt" #date part of tar file name FILEDATE=`date --date="last month" +%Y_%m` #create file to be used by tar touch "${FILENAME}" #create start and end dates of backup directories to be tarred touch --date "${FIRST_DAY}" "/tmp/start" touch --date "${LAST_DAY}" "/tmp/end" #identify the directories to be tarred and add them to the file to be used by tar find "/data/nightly_data_backup" -type d -newer "/tmp/start" -not -newer "/tmp/end" -print | sort > "${FILENAME}" #start portmap service service portmap start #open connection to NAS mount -t nfs "netdisk219:/mnt//vol001/volume02/Archive/Database" "/backup" #back up the database directories to NAS tar -czf "/backup/${FILEDATE}.tar.gz" --files-from "${FILENAME}" #close connection to NAS umount "/backup" #stop portmap service service portmap stop #clean up rm -f "/tmp/start" "/tmp/end" rm -f "/root/${FILENAME}"
Each night, a main database on a db server is backed up on that server before nightly transactions are run, and after they're run. Each before and after database, along with the db transaction log, is placed in its own sub-directory named for the date of the backup, as in "20120516" and "20120516_after". After a month's worth of these backups are created, I archive them on a NAS device. After three months, I delete the oldest backups on the db server. Rather than do this manually, I was looking to automate at least most of the process. Hence the script.
