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Usage:
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For help with the syntax type greprename -h. This will print the usage info:
greprename [-hvefFdDs] 's/PATTERN/REPLACEMENT/[egi]' FILE ...
Options: -h, --help - display this help text
-v, --version - display version information
-e, --examples - display usage examples
-f - rename files
-F - do NOT rename files
-d - rename directories
-D - do NOT rename directories
-s - display preview only (simulation mode)
Notes: Ommitting any of the file renaming options will cause -f and/or
-d to be assumed as default.
The -f and -F options (or the -d and -D options, respectively)
override each other and the command's actions are determined by
the last one specified.
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Examples:
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To view some usage examples type greprename -e:
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GREPRENAME USAGE EXAMPLES:
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Case 1: To change the file extension of every file from .jpg to .jpeg, type:
greprename 's/\.jpg$/\.jpeg/' *
Examples: file_one.jpg ==> file_one.jpeg
file_two.jpg ==> file_two.jpeg
file_three.jpg ==> file_three.jpeg
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Case 2: To apply case transformations to every file, e.g. form words (= make
its first char uppercase and the following chars lowercase), type:
greprename 's/([[:alpha:]])([[:alpha:]]+)/\u$1\L$2/g' *
Note the 'g'-modifier (= global) at the end which causes every occurrence to
get processed. Otherwise, only the first match would be transformed!
Examples: file_one ==> File_One
file_two ==> File_Two
file_three ==> File_Three
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Case 3: To re-arrange JPEG files with date info (e.g., from "dd.mm.yyyy" to
"yyyy-mm-dd") so that they sort correctly in the finder, type:
greprename 's/(\d{2})\.(\d{2})\.(\d{4})/$3-$2-$1/' *.jpg
The shell wildcard expression '*.jpg' will filter the current directory for
files with a .jpg file extension causing only JPEG files to be processed.
Examples: 13.01.2002.jpg ==> 2002-01-13.jpg
19.11.2003.jpg ==> 2003-11-19.jpg
31.12.2003.jpg ==> 2003-12-31.jpg
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ADVANCED EXAMPLES (that make use of perls 'e'-modifier which
allows for code execution within the replacement pattern):
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Case 4: To append a dash & an incrementing number to the end of
the file (starting at 10 and incrementing by 1), e.g. type:
greprename 's/.+/"$&-".($ct+9)/e' *
Note the use of the variable $ct. This counter variable gets defined within the
script. Starting at 1, its value will increment by 1 with each rename action.
Examples: file_one ==> file_one-10
file_two ==> file_two-11
file_three ==> file_three-12
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Case 5: To prefix each file name with an incrementing number (starting at
80, incrementing by 10 and padded with leading zeros), e.g. type:
greprename 's/^/sprintf("%03d_",($ct*10+70))/e' *
Examples: file_one ==> 080_file_one
file_two ==> 090_file_two
file_three ==> 100_file_three
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Case 6: To take any existing number(s) from a file name & multiply
each of the numbers found by the factor 2, type:
greprename 's/\d+/($&*2)/eg' *
Examples: 2-file-1 ==> 4-file-2
file-20 ==> file-40
400-file ==> 800-file
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Case 7: To take (the first) existing number from a file name & reformat
it with padding spaces (upto a depth of 4 chars), e.g. type:
greprename 's/(\D+)(\d+)/sprintf("$1%4d",$2)/e' *
Examples: file-1 ==> file- 1
file-20 ==> file- 20
file-400 ==> file- 400
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