这些都是我工作至今或多或少用到过的，单纯地陈列这些命令没什么用，关键是要在合适的场景选择合适的工具去解决问题，这里就是给自己提个醒儿，也是出于好奇统计一下自己的知识储备。
a
awk (data processing and extracting), alias, at(schedule job one time), arp(check layer2 to layer3 mapping), ab(apach HTTP server benchmark tool), apropos, aspell, ack(grep like search for source code)
b
base64(encode/decode), bg, basename(last name), blkid, bzip2, bc
c
cat, cd, cp, cut ,curl ,chown ,chmod ,chgrp ,cron ,clear, cal(calendar), comm
d
df(disk space check), dirname(path prefix), du(occupied space check), diff, date, dd(convert and copy), dnsdomainname, dig(dns lookup utility), disown(remove job from current job list)
e
echo, exit, export, env, exportfs, ethtool(physical card), eval, expand(tab to spaces)
f
file, free, find, fg, firewall-cmd, fallocate(fast allocate space), fuser, fsck, fold, fmt
g
gzip, grep, git, gitk, getfacl, getent(look up /etc/hosts)
h
hostname, host, htpasswd, history, hostnamectl(permenant hostname), hdparm d
i
ip(so powerful), ifconfig(obsolete), id, iperf3, iptables, iostat, ifdown, ifup, install(copy files and set attributes)
j
jq, jobs, journalctl, join
k
kill
l
ls, less, ln, lsblk, lvdisplay, lscpu, lastlog, last(reboot), losetup, lsof(list open files), loginctl, lvm, lvreate, lvextend, lvresize, lvreduce, lvemove, lvdisplay, locate
m
mv, mount, more, man, mkdir, mktemp, mdadm, make, mkfifo(named pipe), mpstat
n
nc, netstat, nslookup, nmap, nice(process priority), nmcli, nohup, nl, numfmt(unit convert)
o
openssl
p
pwd, ping, ps, perf, pvdisplay, pmap, pwdx, pv(throttle the progress of data through a pipe), pvcreate, pvscan, paste, patch, printf, pidstat
q
so far no!
r
rm, rmdir, route, rsync, readlink, runlevel, renice, rpm, rev(reverse seq), reset
s
ssh, scp, sftp, strace, sudo, su, sed(stream editor), setfacl,
sleep, stat, systemctl, shutdown, sar(system activity report), ss(similar to netstat), stress, stress-ng, sort, seq, sync, sshfs, screen, script, set, split, strings(print printable chars in files)
t
tar, tcpdump(wireshark), tcpreplay, top(powerful!), trap, touch, tee, tail, tree, tracepath, traceroute, tload, tc(traffic control), tac(reversion of cat), truncate, tr(translate), timeout, tmux
u
uniq, uname, umount, unlink, uuidgen, uptime, udevadm, unalias
v
vim, vmstat, vgcreate, vgextend, vgreduce, vgremove, vgdisplay
w
w, who, wget, wc, wall, write, watch, wipefs
x
xargs
y
yum, yes
z
zip