MAC下安装或更新fvm的sh

#!/bin/bash
if ! command -v brew &> /dev/null; then
    echo "错误: 请先安装(Homebrew)"
    exit 1
fi
echo "========================================"
ZPROFILE=~/.zprofile
[[ -f $ZPROFILE ]] && source $ZPROFILE
if ! command -v fvm &> /dev/null; then
    echo "安装(fvm)"
    brew tap leoafarias/fvm
    brew install fvm
    if ! grep -q 'export PATH=$HOME/fvm/default/bin:$PATH' "$ZPROFILE"; then
        echo 'export PATH=$HOME/fvm/default/bin:$PATH' >> $ZPROFILE
        source $ZPROFILE
    fi
else
    echo "更新(fvm)"
    brew upgrade fvm
fi
dart pub global activate fvm
echo "已经安装: $(fvm --version)"
echo "========================================"
exit 0