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# is x grep argument available?
grep-flag-available() {
echo | grep $1 "" >/dev/null 2>&1
}
GREP_OPTIONS=""
# color grep results
if grep-flag-available --color=auto; then
GREP_OPTIONS+=" --color=auto"
fi
# ignore VCS folders (if the necessary grep flags are available)
VCS_FOLDERS="{.bzr,CVS,.git,.hg,.svn}"
if grep-flag-available --exclude-dir=.cvs; then
GREP_OPTIONS+=" --exclude-dir=$VCS_FOLDERS"
elif grep-flag-available --exclude=.cvs; then
GREP_OPTIONS+=" --exclude=$VCS_FOLDERS"
fi
# export grep settings
alias grep="grep $GREP_OPTIONS"
# clean up
unset GREP_OPTIONS
unset VCS_FOLDERS
unfunction grep-flag-available
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