06/09/21 07:58:39
# cat seq
#! /bin/sh
if [ $# -lt 1 ]; then
echo missing operand 1>&2
exit 1
elif [ $# -gt 3 ]; then
echo extra operand 1>&2
exit 1
elif [ $# -eq 1 ]; then
FIRST=1
INC=1
LAST=$1
elif [ $# -eq 2 ]; then
FIRST=$1
INC=1
LAST=$2
elif [ $# -eq 3 ]; then
FIRST=$1
INC=$2
LAST=$3
fi
n=$FIRST
while [ "$n" -le "$LAST" ]; do
echo "$n"
n=`expr "$n" + "$INC"`
done