Introduction to a collection of commonly used and convenient commands and techniques in Centos

1. Many times, you need to know what large files there are in the current system, for example, the file size exceeds 100M or 1G (the threshold depends on the specific situation). So how to search these large files?

#For example: I want to search for files exceeding 900M in the current directory

find . -type f -size 900M -print0 | xargs -0 du -h

2. Sometimes there is a disk space alarm, and you usually neglect to manage and monitor the growth of files. Then I need to quickly understand which directories have become larger. At this time, we can use the du command to help us solve the problem. this problem.

#For example: I want to query which directory under the root directory has become larger (of course I think it must be /var)

cd /

du -h --max-depth=1

3. Return to the home directory

cd ~

4. If you want to know the status of the memory, you can use free and vmstat. You need to pay attention to the cached value, which is the memory occupied by the kernel, and the free value.

5. Use dmesg to check some hardware or driver information or problems.

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