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将文件 file1.txt 设为所有人皆可读取 : ~~~ chmod ugo+r file1.txt ~~~ ~~~ chmod a+r file1.txt ~~~ ``` chmod 777 chmod 755 ``` 
diff
ls
chmod
groups user
head
more
cat
less
find
df
who
su
ansible
free
history
grep
sed
cut
新能监控
vim
uname
man
cd
chown
chgrp
vmstat
awk
ps -ef grep XXX
make
bsub
感叹号
感叹号1
scp
linux 清除当前写的命令