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plain) (
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#!/bin/ash
str_trim() {
if [ $# = 0 ]; then
tr '\n' '\r' | sed -r 's/^[[:space:]]+//;s/[[:space:]]+$//' | tr '\r' '\n'
else
printf "%s" "$*" | tr '\n' '\r' | sed -r 's/^[[:space:]]+//;s/[[:space:]]+$//' | tr '\r' '\n'
fi
}
str_upper() {
if [ $# = 0 ]; then
tr 'a-z' 'A-Z'
else
printf "%s" "$*" | tr 'a-z' 'A-Z'
fi
}
str_lower() {
if [ $# = 0 ]; then
tr 'A-Z' 'a-z'
else
printf "%s" "$*" | tr 'A-Z' 'a-z'
fi
}
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