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====== 常用的命令 ======
===== 文件目录管理命令 =====
==== touch ====
<code>
touch 1.txt
</code>
==== cp ====
<code>
cp -p old.txt new.txt
cp -r olddir newdir
cp -a old.txt new.txt
</code>
==== rm ====
<code>
rm -rf old.txt
</code>

===== 系统工作命令 =====
==== passwd ====