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| how to get the size of everything in your file | |
| du -sh * | |
| how to see the first N lines of a file | |
| cat -N file.txt | |
| how to see the last N lines of a file | |
| head -N file.txt | |
| set the permissions such that you can only & admin can only access the file | |
| chmod-orwx file.name |
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