Common operation and Maintenance commands for Linux systems

To view memory:
Top
To view disk space:
Df-hl
To write the cache to a file:
Sync
Clear Memory:
Echo 1 >/proc/sys/vm/drop_caches
To view memory:
Top
The Sync:sync command runs the Sync subroutine. If you must stop the system, run the Sync command to ensure the integrity of the file system. The sync command writes all non-writable system buffers to disk, including modified I-node, deferred block I/O, and read-write mapping files
Echo 1 0 Default 1 empty page cache 2 empty inode and directory tree Cache 3 empty all caches
To view the number of connections for a port:
Netstat-nat|grep-i "8080" |wc-l

Common operation and Maintenance commands for Linux systems