脚本是：
USERNAME=tsit
if id -u ${USERNAME} >/dev/null 2>&1 ; then
echo "User ${USERNAME} exists."
else
echo "User ${USERNAME} does not exist!"
fiLINUX SHELL判断一个用户是否存在
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脚本是：
USERNAME=tsit
if id -u ${USERNAME} >/dev/null 2>&1 ; then
echo "User ${USERNAME} exists."
else
echo "User ${USERNAME} does not exist!"
fi
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