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Mass File Renamer: By Pattern Substitution

Posted 09-13-2008 at 10:37 PM by ghostdog74

Code:
#!/bin/bash
## Change file names with a pattern substitution.
NO_ARGS=0 
E_OPTERROR=65
DEBUG=0
FNAME="f"
maxdepth=1
directory=`pwd`
set -o noglob

#---- Functions ------------#

usage() {
 printf "Usage: `basename $0` [-D directory] [-M depth] [-s pattern_from ] [-e pattern_to ] [-d] [-X] [filename(s)]\n"
 cat << 'EOF'
        -D : starting directory. Default=current directory
        -M : max depth to recurse subdirectories (default=1), eg 1,2
        -s : pattern to change from. Can be simple shell patterns. eg [0-9], [a-z], "pattern1|pattern2".
             To input special characters, eg "[\`&*]",'[`&*]'
        -e : pattern to change to. To rename to null, use "". eg -e ""
        -d : Debugging mode. Used to list all files to be changed, without changes taking effect
        -X : Only check directory names, not file names
        filename(s) : file names eg *.txt. If omitted, default to all files        
        Example: -s file -e test -d *.txt ===> change all name of text files 
                 with pattern "file" to "test". eg file_copy.txt will be changed to test_copy.txt
        
EOF

}
#----------------------------#

if [ $# -eq "$NO_ARGS" ]  # Script invoked with no command-line args?
then
   usage
   exit $E_OPTERROR        # Exit and explain usage, if no argument(s) given.
fi  


while getopts "D:s:e:M:Xd" Option
do
  case $Option in
    D     ) directory=$OPTARG
            ;;
    s     ) startseq=$OPTARG            
            [ -z "${startseq}" ] && echo "Pattern not specified. Use -s <pattern_from> and -e <pattern_to>" && exit    
            ;;
    e     ) endseq=$OPTARG
            [ -z "${endseq}" ] && endseq=""
            ;;    
    d     ) DEBUG=1 ;;
    X     ) FNAME="d";;
    M     ) maxdepth=$OPTARG
            case ${maxdepth} in
                0 | *[a-z]* |"") maxdepth=1;;   
            esac
            ;;
    *     ) echo "Unimplemented option chosen."
            exit;;
  esac
done
shift $(($OPTIND - 1))


# get last argument

argument=$#
if [ $argument -eq 0 ];then
    ext="*"
else    
    ext=$(eval echo \"\${${argument}}\")
fi



find "${directory}" -maxdepth ${maxdepth} -type "${FNAME}" -name "$ext" -printf "%f:%h:%p\n" | \
awk -F":" -v startseq="${startseq}" -v endseq="${endseq}" -v debug="$DEBUG" 'BEGIN{}
$1 ~ startseq{       
    original=$1
    sq="\047"
    q="\042"
    flag=0
    s = gsub (startseq, endseq,$1 )
    if ( startseg ~ /'"\'"'/) { sq="\042" }    
    if ( startseq ~ /[[:punct:]]/ ) { flag=1} #if found special characters/punctuation
    if ( debug) {
        if(flag) { print "mv -u " q $2"/" q sq original sq " "q $2 "/" $1 q  }
        else{   print "mv -u " q $3 q " "q $2 "/" $1 q        }
    }
    else {
         if(flag) { cmd= "mv -u " q $2"/" q sq original sq " "q $2 "/" $1 q }
         else{  cmd = "mv -u " q $3 q " "q $2 "/" $1 q }
         system(cmd)
    }
    
}'
Usage:

Usage:

The script makes use of GNU find/awk. Maximum depth value passed to "find" is set to default 1 level. Issue -M <level> to recurse more than 1 level of subdirectories. File types is set to search for files by default. Issue -X to search for directory names. If -D <directory> is omitted, the script searches from current working directory onwards.

# Execute the script name without any arguments to show help.
> ./script.sh

# To see results before making actual changes, use the -d switch.
> ./script.sh -D /path/1 -M 2 -s "from" -e "to" [color=red]-d[/code] "*.txt"

# To rename files with extension ".txt" and word "image" in their file names to "file" and search directories for 2 levels.
> ./script.sh -D /path/1 -M 2 -s "image" -e "file" "*.txt"

# To rename all files in the current directory with word "file" or "image" to "test" without traversing directories
> ./script.sh -s "file|image" -e "test" -d

# To rename all files in current directory with more than 1 numbers to "test".
> ./script.sh -s "[0-9]+" -e "test" -d

# To replace special characters eg ' (single quote), & ,!
> ./script.sh -s "[!]" -e "" -d
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