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#!/bin/sh
# Usage: dateReverser.sh [-s SEPARATOR] [-i[BACKUP_SUFFIX]] [FILE]...
#
# Reverses the order of dates found in files (dates have the format n-n-n)
# and prints the result to standard output.
#
# With -i makes changes directly in the files instead and creates a backup if
# BACKUP_SUFFIX is specified.
# Reads from stdin if no arguments specified.
helpMessage="usage: dateReverser.sh [-s SEPARATOR] [-i[BACKUP_SUFFIX]] [FILE]...
-s SEPARATOR
Uses SEPARATOR instead of \"-\" as date field separator
-i[BACKUP_SUFFIX]
Actually edit files instead of print to standard output
Make backup files if BACKUP_SUFFIX is specified"
sep="-"
inFile=""
while echo "$1" | grep -q '^-'; do
case "$1" in
"-s" )
sep="$2"
if echo "$sep" | grep -q '/'; then
sep="$(echo "$2" | sed 's|/|\\/|g')"
fi
shift 2 ;;
"-i"* )
inFile="$1"
shift ;;
* )
echo "$helpMessage"
exit 1;;
esac
done
for file in "$@"; do
if [ -n "$file" ] && [ ! -f "$file" ]; then
echo "Error: file $file not found"
exit 1
fi
done
sedscr='s/\([0-9][0-9]*\)'"$sep"'\([0-9][0-9]*\)'"$sep"'\([0-9][0-9]*\)/\3'"$sep"'\2'"$sep"'\1/g'
sed $inFile $sedscr "$@"
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