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System
Uptime
$ uptime
19:47 up 7:55, 3 users, load averages: 3.32 3.82 4.10
Usage
Breakdown of sorted sizes of files and directories at current level. Sorted by human-readable sizes and reversed.
$ du -hsc * | sort -hr
Processes
Process status
ps -- process status
$ ps
PID TTY TIME CMD
1031 ttys004 0:00.04 ...
1033 ttys004 0:00.19 -zsh
...
$ ps aux
Process status tree
pstree is a Linux command that shows the running processes as a tree. It is used as a more visual alternative to the ps command. The root of the tree is either init or the process with the given pid. It can also be installed in other Unix systems.
pstree [options] [pid or username]
$ pstree
Note your OS may have GUI for this. Like macOS Activity Manager.
Processes list
top -- display and update sorted information about processes
$ top
Processes: 445 total, 3 running, 442 sleeping, 2434 threads 19:57:10
Load Avg: 5.39, 5.14, 4.64 CPU usage: 24.94% user, 18.35% sys, 56.70% idle SharedLibs: 209M resident, 57M data, 22M linkedit.
MemRegions: 131547 total, 3448M resident, 106M private, 3790M shared. PhysMem: 16G used (3558M wired), 97M unused.
VM: 2193G vsize, 1882M framework vsize, 0(0) swapins, 0(0) swapouts. Networks: packets: 3646305/2277M in, 2200838/1228M out. Disks: 1305417/11G read, 945445/8111M written.
PID COMMAND %CPU TIME #TH #WQ #PORT MEM PURG CMPRS PGRP PPID STATE BOOSTS %CPU_ME %CPU_OTHRS UID FAULTS COW MSGSENT MSGRECV
20854 zoom.us 50.0 33:28.26 63 7 1393+ 312M- 15M- 68M 20854 1 sleeping *0[422] 1.06707 0.23404 1523680666 31247352+ 1416 10628072+ 5334433+
956 iTerm2 33.3 00:27.45 12 9 387+ 449M+ 108M- 32M- 956 1 sleeping *0[1039] 0.01776 2.43655 1523680666 1201646+ 1803 144076+ 41923+
More colorful and sortable and lets you action on items.
htop - interactive process viewer
Install first.
$ htop