#!/bin/sh

trim()

{

    trimmed=$1

    trimmed=${trimmed%% }

    trimmed=${trimmed## }

    echo $trimmed

}

测试：

a=" x x "

b=" b b"

c="c c "

echo "=$a="

echo "=$b="

echo "=$c="

a=$(trim $a)

b=$(trim $b)

c=$(trim $c)

echo "=$a="

echo "=$b="

echo "=$c="

输出：

= x x =

= b b=

=c c =

=x=

=b=

=c=


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