utils.sh
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#!/bin/dash
##
# make definitions only when not already defined
#
command -v filename2symbol >/dev/null
if [ $? -ne 0 ]
then
filename2symbol() {
local SYM="${1}"
if [ 1 -ne $# ]
then
logger -p syslog.err 'filename2sybol: missing filename'
exit 1
fi
while [ "${SYM}" != "${SYM%/*}" -o "${SYM}" != "${SYM%.*}" ]
do
if [ "${SYM}" != "${SYM%.*}" ]
then
SYM="${SYM%%.*}_${SYM#*.}"
else
SYM="${SYM%%/*}_${SYM#*/}"
fi
done
echo "${SYM}"
}
canonify_name() {
local FILE="${1}"
local DIR="${PWD}"
# if FILE starts with a / its already canonified
if [ "${FILE}" != ${FILE#/} ]
then
echo "${FILE}"
return 0
fi
# simply remove ./ and make a ../ remove a part from pwd
while [ "${FILE}" != ${FILE#./} -o "${FILE}" != ${FILE#../} ]
do
if [ "${FILE}" != ${FILE#./} ]
then
FILE="${FILE#./}"
else
FILE="${FILE#../}"
DIR="${DIR%/*}"
fi
done
echo "${DIR}/${FILE}"
}
include_once() {
local FILE="$(canonify_name "${1}")"
local SYM="$(filename2symbol "${FILE}")"
if [ 1 -ne $# ]
then
logger -p syslog.err 'include_once: missing filename'
exit 1
fi
if eval [ -z \"\${SOURCED_${SYM}}\" ]
then
. ${FILE}
eval export SOURCED_${SYM}=\"\${FILE}\"
fi
}
##
# get and export the locations of used programs and export them
# I assume that on every UNIX/shell variant at least [ is globally
# available. I will use it throughout all other scripts without
# checking for existence.
# I also assume through all scripts that eval is available.
#
[ -z "${WHICH}" ] && WHICH="/usr/bin/which"
[ -z "${UNAME}" ] && UNAME="$(${WHICH} uname)"
[ -z "${GREP}" ] && GREP="$(${WHICH} grep)"
[ -z "${AWK}" ] && AWK="$(${WHICH} awk)"
[ -z "${ECHO}" ] && ECHO="$(${WHICH} echo)"
[ -z "${SORT}" ] && SORT="$(${WHICH} sort)"
[ -z "${TR}" ] && TR="$(${WHICH} tr)"
[ -z "${PRINTF}" ] && PRINTF="$(${WHICH} printf)"
[ -z "${LOGGER}" ] && LOGGER="$(${WHICH} logger)"
[ -z "${IP}" ] && IP="$(${WHICH} ip)"
[ -z "${IFCONFIG}" ] && IFCONFIG="$(${WHICH} ifconfig)"
export WHICH UNAME GREP AWK ECHO SORT TR PRINTF LOGGER IP IFCONFIG
fi
# vim: set ts=4 sw=4: