All Important Linux Commands


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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