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Initial data commit

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Ingy döt Net 2023-07-01 11:58:00 -04:00
parent 72d218235f
commit f23f22d71c
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17
Task/Substring/UNIX-Shell/substring-2.sh Normal file
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str="abc qrdef qrghi"
n=6
m=3
expr "x$str" : "x.\{$n\}\(.\{1,$m\}\)"
expr "x$str" : "x.\{$n\}\(.*\)"
expr "x$str" : "x\(.*\)."
index() {
i=0 s=$1
until test "x$s" = x || expr "x$s" : "x$2" >/dev/null; do
i=`expr $i + 1` s=`expr "x$s" : "x.\(.*\)"`
done
echo $i
}
expr "x$str" : "x.\{`index "$str" r`\}\(.\{1,$m\}\)"
expr "x$str" : "x.\{`index "$str" qr`\}\(.\{1,$m\}\)"