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|
#
# substr -- a function to emulate the ancient ksh builtin
#
#
# -l == shortest from left
# -L == longest from left
# -r == shortest from right (the default)
# -R == longest from right
substr()
{
local flag pat str
local usage="usage: substr -lLrR pat string or substr string pat"
case "$1" in
-l | -L | -r | -R)
flag="$1"
pat="$2"
shift 2
;;
-*)
echo "substr: unknown option: $1"
echo "$usage"
return 1
;;
*)
flag="-r"
pat="$2"
;;
esac
if [ "$#" -eq 0 ] || [ "$#" -gt 2 ] ; then
echo "substr: bad argument count"
return 2
fi
str="$1"
#
# We don't want -f, but we don't want to turn it back on if
# we didn't have it already
#
case "$-" in
"*f*")
;;
*)
fng=1
set -f
;;
esac
case "$flag" in
-l)
str="${str#$pat}" # substr -l pat string
;;
-L)
str="${str##$pat}" # substr -L pat string
;;
-r)
str="${str%$pat}" # substr -r pat string
;;
-R)
str="${str%%$pat}" # substr -R pat string
;;
*)
str="${str%$2}" # substr string pat
;;
esac
echo "$str"
#
# If we had file name generation when we started, re-enable it
#
if [ "$fng" = "1" ] ; then
set +f
fi
}
|
