Linux is one of the important Operating System, and based on the kernel there are many other OS these days. One has to be Linux friendly in order to work with many devices, specially Security Appliances. It is primarily a command based OS, which also comes with GUI options like GNOME. Here are all important Linux commands that are useful they are basic as well as advanced commands:
1) awk/nawk [options] file
2) cat [options] file
3) cd [directory]
4) chgrp [options] group file
5) chmod [options] file
6) chown [options] owner file
7) chsh (passwd -e/-s) username login_shell
8) cmp [options] file1 file2
9) compres [ options] file
10) cp [options] file1 file2
11) cut [options] [files]
12) date [options]
13) dd [if=infile] [of=outfile] [operand=value]
14) diff [options] file1 file2
15) df [options] [resource]
16) du [options] [directory or file]
17) echo [text string]
18) ed or ex [options] files
19) emacs [options] files
20) expr arguments
21) file [options] files
22) find directory [options] [actions]
23) finger [options] user [@hostname]
24) ftp [options] host
25) grep [options] 'search string' arguments/
egrep [options] 'search string' arguments/
fgrep [options] 'search string' arguments/
26) gzip [options] file/
gunzip [options] file/
zcat [options] file
27) head [-number] file
28) hostname
29) kill [options]
[-SIGNAL]
[pid#] [%job]
30) in [options] source _file target
31) lpq [options]/
lpstat [options]
32) lpr [options] file/
lp [options] file
33) lprm [options]
cancel [options]
34) ls [options] [directory or file]
35) mail [options] [user]
mailx [options] [user]
Mail [options] [user]
36) man [options] command
37) mkdir [options] directory
38) more [options] file
39) less [options] file
40) pg [options] file
41) mv [options] file1 file2
42) od [options] file
43) passwd [options]
44) paste [options] file
45) pr [options] file
46) ps [options]
47) pwd
48) rcp [options] hostname
49) rlogin [options] hostname
50) rm [options] file
51) rmdir [options]directory
52) rsh [options] hostname
53) script file
54) sed [options] file
55) sort [options] file
56) source file . file
57) sttrings [options] file
58) stty [options]
59) tail [options] file
60) tar key [options] [files]
61) tee [options] file
62) telnet [host [port]]
63) touch [options] [date] file
64) tr [options] string1 string 2
65) uncompress file .Z
66) uniq [options] file
67) uudecode [file]
68) vi [options] file
69) wc [options] [files]
70) whereis [options] command
71) which command
72) who or w
73) zcat file.Z
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