创建新文件：touch test.sh

添加可执行权限：chmod +x test.sh

编辑文件：gedit test.sh

输出命令：echo "hello world"

正常退出：exit 0

给命令起别名：alias hello="echo ‘hello world‘"

撤销别名：unalias hello

取命令执行结果：echo "the current directory is $(pwd)" | echo "the current directory is `pwd`"

linux命令