linux命令
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`"
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