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shell programming

summary

    This chapter looks at UNIX (and Linux) shell programming.

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shell programming

    This chapter looks at UNIX (and Linux) shell programming.

    You may wonder why a chapter on shell scripting is in a programming book. And you may not even read this line because your professor probably has cut this entire chapter out of the version used in your class.

    There are actually several good reasons to include a chapter on shell scripting.

    The chapter can serve as background material so that a student new to UNIX (or Linux or Mac OS X) will be able to make effective use of the shell for work on programming assignements.

    There are actual classes in shell scipting, especially at junior colleges and community colleges.

    This chapter goes beyond the typical material in a shell scripting class and presents material related to either downloading and compiling existing software (including ports to new hardware and/or operating systems) or for preparing your own software for release via the internet.

other

   “22. A good system can’t have a weak command language.” —Alan Perlis, Epigrams on Programming, ACM’s SIGPLAN Notices Volume 17, No. 9, September 1982, pages 7-13

chapter contents

1. cool shell tricks
2. UNIX/Linux history
3. choice of shells
4. connecting to a shell (Telnet and SSH; terminal emulator)
5. shell basics (book conventions; root or superuser; starting your shell; login and password; prompt; command example)
6. login/logout (login; select system; account name; password; terminal type; logout; exit)
7. passwd (setting password; local password; periodic changes; 100 most common passwords; secure passwords; superuser)
8. command structure (single command; who; failed command; date; options, switches, or flags; universal time; arguments; options and arguments; operators and special characters)
9. quick tour of shell commands
10. man (using man for help; man sections)
11. cat (creating files; example files for this book; viewing files; combining files)
12. command separator (semicolon)
13. less, more, pg last updated: 27 Aug 2012
14. file system basics (graphics examples; directory tree; important directories; home directory; parent and child directories; absolute paths; relative paths; dots, tildes, and slashes)
15. pwd
16. command history
17. built-in commands
18. ls
19. cd
20. cp
21. mv
22. rm (recursive)
23. sysadmin and root/superuser
24. sudo and root
25. su
26. who
27. major directories
28. shred
29. df
30. du
31. ps
32. w
33. uptime
34. top
35. free
36. vmstat
37. defaults (screencapture; Mac Flashback Trojan)
38. init (init; Linux run levels)
39. ifconfig (view configuration; static IP address)
40. arp
41. netstat (view connections; main info; routing address)
42. route (view connections; routing commands)
43. ping (test packets; measuring)
44. nslookup
45. traceroute (entire route; etiquette)
46. sysstat
47. at (example; removing a job; timing)
48. tar
49. touch (multiple files; specific time)
50. find
51. sed (fixing end of line; adding line numbers)
52. awk (remove duplicate lines)
53. screencapture (from graphic user interface; changing defaults; command line screenshots)
54. installing software from source
55. test bed
56. grep
57. ssh
58. vim
59. diff
60. sort
61. export
62. xargs
63. gzip
64. bzip2
65. unzip
66. shutdown
67. ftp
68. crontab
69. service
70. kill
71. mount
72. chmod
73. chown
74. mkdir
75. uname
76. whereis
77. whatis
78. locate
79. tail
80. mysql
81. yum
82. rpm
83. date
84. wget
85. file permissions
86. nano
87. troff
88. Forth-like routines

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