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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. shred
24. mkdir
25. alias
26. pipe
27. sysadmin and root/superuser
28. sudo and root
29. su
30. who
31. advanced file systems
32. major directories
33. Network File System (NFS)
34. chmod
35. chown
36. management tools
37. df
38. du
39. processes
40. ps
41. kill
42. nice
43. w
44. uname
45. uptime
46. top
47. lsof
48. free
49. vmstat
50. defaults (screencapture; Mac Flashback Trojan)
51. init (init; Linux run levels)
52. sendmail
53. ifconfig (view configuration; static IP address)
54. arp
55. netstat (view connections; main info; routing address)
56. route (view connections; routing commands)
57. ping (test packets; measuring)
58. nslookup
59. traceroute (entire route; etiquette)
60. cURL
61. sysstat
62. at (example; removing a job; timing)
63. back ups
64. tar
65. touch (multiple files; specific time)
66. find
67. sed (fixing end of line; adding line numbers)
68. awk (remove duplicate lines)
69. screencapture (from graphic user interface; changing defaults; command line screenshots)
70. signals
71. LAMP
72. installing software from source
73. test bed
74. grep
75. ssh
76. vim
77. diff
78. sort
79. export
80. xargs
81. gzip
82. bzip2
83. unzip
84. shutdown
85. ftp
86. crontab
87. service
88. mount
89. whereis
90. whatis
91. locate
92. tail
93. mysql
94. yum
95. rpm
96. date
97. wget
98. file permissions
99. nano
100. troff
101. command summaries
102. Forth-like routines

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