12. More Scripts

12.1 Applying a command to all files in a directory.

12.2 Sample: A very simple backup script (little bit better)

       #!/bin/bash     
       SRCD="/home/"
       TGTD="/var/backups/"
       OF=home-$(date +%Y%m%d).tgz
       tar -cZf $TGTD$OF $SRCD
      

12.3 File re-namer

     
   #!/bin/sh
   # renna: rename multiple files according to several rules
   # written by felix hudson Jan - 2000
   
   #first check for the various 'modes' that this program has
   #if the first ($1) condition matches then we execute that portion of the
   #program and then exit
   
   # check for the prefix condition
   if [ $1 = p ]; then
   
   #we now get rid of the mode ($1) variable and prefix ($2)
     prefix=$2 ; shift ; shift
   
   # a quick check to see if any files were given
   # if none then its better not to do anything than rename some non-existent
   # files!!
   
     if [$1 = ]; then
     echo "no files given"
     exit 0
     fi
   
   # this for loop iterates through all of the files that we gave the program
   # it does one rename per file given
     for file in $*
    do
    mv ${file} $prefix$file
     done
   
   #we now exit the program
     exit 0
   fi
   
   # check for a suffix rename
   # the rest of this part is virtually identical to the previous section
   # please see those notes
   if [ $1 = s ]; then
     suffix=$2 ; shift ; shift
   
   if [$1 = ]; then
    echo "no files given"
   exit 0
   fi
   
    for file in $*
     do
   mv ${file} $file$suffix
    done
   
    exit 0
   fi
   
   # check for the replacement rename
   if [ $1 = r ]; then
   
     shift
   
   # i included this bit as to not damage any files if the user does not specify
   # anything to be done
   # just a safety measure
   
     if [ $# -lt 3 ] ; then
    echo "usage: renna r [expression] [replacement] files... "
    exit 0
     fi
   
   # remove other information
     OLD=$1 ; NEW=$2 ; shift ; shift
   
   # this for loop iterates through all of the files that we give the program
   # it does one rename per file given using the program 'sed'
   # this is a sinple command line program that parses standard input and
   # replaces a set expression with a give string
   # here we pass it the file name ( as standard input) and replace the nessesary
   # text
   
     for file in $*
     do
    new=`echo ${file} | sed s/${OLD}/${NEW}/g`
    mv ${file} $new
     done
   exit 0
   fi
   
   # if we have reached here then nothing proper was passed to the program
   # so we tell the user how to use it
   echo "usage;"
   echo " renna p [prefix] files.."
   echo " renna s [suffix] files.."
   echo " renna r [expression] [replacement] files.."
   exit 0
   
   # done!
   
     

12.4 File renamer (simple)

     #!/bin/bash
     # renames.sh
     # basic file renamer

     criteria=$1
     re_match=$2
     replace=$3
     
     for i in $( ls *$criteria* ); 
     do
    src=$i
    tgt=$(echo $i | sed -e "s/$re_match/$replace/")
    mv $src $tgt
     done
     

12.5 MySQL Backup Script

#!/bin/bash

USER="<your mysql user>"
PASSWORD="<your mysql password>"
OUTPUT="/media/windowsshare/mysql/"

rm "$OUTPUTDIR/*gz" > /dev/null 2>&1

databases=`mysql --user=$USER --password=$PASSWORD -e "SHOW DATABASES;" | tr -d "| " | grep -v Database`

for db in $databases; do
    if [[ "$db" != "information_schema" ]] && [[ "$db" != _* ]] ; then
   echo "Dumping database: $db"
   mysqldump --force --opt --user=$USER --password=$PASSWORD --databases $db > $OUTPUT/`date +%Y%m%d`.$db.sql
   gzip $OUTPUT/`date +%Y%m%d`.$db.sql
    fi
done

# Update USER, PASSWORD, and OUTPUT