how to check memory and CPU stats in Linux ?

Question : how to check memory and  CPU status in Linux ?

Question : what command will you used to check memory and cpu status ?

Question : how to check CPU status ?

Question : how to check memory status ?

1. free

free command  give us valuable information on available RAM / Memory

# free

# free --help

usage: free [-b|-k|-m|-g|-h] [-l] [-o] [-t] [-s delay] [-c count] [-V]

  -b,-k,-m,-g show output in bytes, KB, MB, or GB

  -h human readable output (automatic unit scaling)

  -l show detailed low and high memory statistics

  -o use old format (no -/+buffers/cache line)

  -t display total for RAM + swap

  -s update every [delay] seconds

  -c update [count] times

  -a show available memory if exported by kernel (>80 characters per line)


  -V display version information and exit

2. vmstat

vmstat command give us information about processes,  memory/RAM,cpu activity and more.

# vmstat 

# vmstat --help

usage: vmstat [-V] [-n] [delay [count]]

              -V prints version.

              -n causes the headers not to be reprinted regularly.

              -a print inactive/active page stats.

              -d prints disk statistics

              -D prints disk table

              -p prints disk partition statistics

              -s prints vm table

              -m prints slabinfo

              -t add timestamp to output

              -S unit size

              delay is the delay between updates in seconds.

              unit size k:1000 K:1024 m:1000000 M:1048576 (default is K)


              count is the number of updates.

3 top

top command give us information like tasks, memory, CPU and swap and more

# top 

# top --help