Swap Space monitoring command for centOS

#swapon --all

#swapon --summary

#cat /proc/swaps

#free -h

#top

#atop

#htop

#glances

#vmstat

# vmstat -s

#sync; echo 3 less then /proc/sys/VM/drop_caches

#du -su /root
#df -h, a, m, i, T
#df -hT /home
#df -x ext3

# cat /proc/meminfo
MemTotal:        3618884 kB
MemFree:          165928 kB
MemAvailable:    2740908 kB
Buffers:               4 kB
Cached:          2785156 kB
SwapCached:            0 kB
Active:          2238752 kB
Inactive:        1049704 kB
Active(anon):     541204 kB
Inactive(anon):    44604 kB
Active(file):    1697548 kB
Inactive(file):  1005100 kB
Unevictable:           0 kB
Mlocked:               0 kB
SwapTotal:             0 kB
SwapFree:              0 kB
Dirty:               156 kB
Writeback:             0 kB
AnonPages:        503296 kB
Mapped:            26492 kB
Shmem:             82512 kB
Slab:             102216 kB
SReclaimable:      82532 kB
SUnreclaim:        19684 kB
KernelStack:        3072 kB
PageTables:        14240 kB
NFS_Unstable:          0 kB
Bounce:                0 kB
WritebackTmp:          0 kB
CommitLimit:     1809440 kB
Committed_AS:    1027300 kB
VmallocTotal:   34359738367 kB
VmallocUsed:       17532 kB
VmallocChunk:   34359715580 kB
HardwareCorrupted:     0 kB
AnonHugePages:    237568 kB
HugePages_Total:       0
HugePages_Free:        0
HugePages_Rsvd:        0
HugePages_Surp:        0
Hugepagesize:       2048 kB
DirectMap4k:       59392 kB
DirectMap2M:     4134912 kB

know version
#cat /etc/centos-release
#cat /etc/redhat-release

to know process
#cat /proc/cpuinfo