如何在另一个 bash 脚本编写的 bash 脚本中转义 shell 命令

how to escape a shell command in bash script written by another bash script

谁能告诉我如何在另一个 bash 脚本编写的 bash 脚本中转义 shell 命令?

例如我的脚本如下:

sudo sh -c "echo \"if who | grep tty | grep \`whoami\` > /dev/null\"        > test.sh"  
sudo sh -c "echo \"then\"                                                  >> test.sh"
sudo sh -c "echo \"    echo ' log in '\"                                       >> test.sh"
sudo sh -c "echo \"else\"                                                  >> test.sh"
sudo sh -c "echo \"    exit\"                                              >> test.sh"
sudo sh -c "echo \"fi\"                                                    >> test.sh"

我希望脚本 test.sh 包含

if who | grep tty | grep `whoami`> /dev/null
then
    echo 'user  is log in '
else
    exit
fi

实际上命令whoami被root替换了。

解决方案:

sudo tee /usr/local/bin/test.sh  << 'EOF'
if who | grep tty | grep `whoami`> /dev/null
then
    echo 'user  is log in '
else
    exit
fi
EOF

使用 heredoc 最容易处理复杂的引号:

cat > test.sh << 'EOF'
if who | grep tty | grep `whoami`> /dev/null
then
    echo 'user  is log in '
else
    exit
fi
EOF