Linux 101 Hacks – Download Free eBook









I’m happy to announce the release of my first Free eBook — Linux 101 Hacks. There are total of 101 hacks in this book that will help you build a strong foundation in Linux. All the hacks in this book are explained with appropriate Linux command examples that are easy to follow.



This free eBook contains 12 chapters with total of 140 pages. Hacks mentioned in 6 chapters are based on the articles that I’ve already posted on my blog. Hacks mentioned in rest of the 6 chapters are brand new.



If you like this eBook, please submit this post to your favorite social-media sites and spread the news.





“Another collection of hacks? Yes! If you have just completed your first admin course or looking for better ways to get the job done the “Linux 101 Hacks” eBook is a good point to start. These useful tips are concise, well written and easy to read.



Well done – I will recommend this eBook to my students.” — Prof. Dr. Fritz Mehner, FH Südwestfalen, Germany (Author of several awesome Vim plugins, including bash-support Vim plugin)

Download Free eBook



Download Free eBook: Linux 101 Hacks

Password: To get the password, follow these 3 easy steps.





Linux 101 Hacks – Table of Contents

Chapter 1: Powerful CD Command Hacks

Hack 1. Use CDPATH to define the base directory for cd command

Hack 2. Use cd alias to navigate up the directory effectively

Hack 3. Perform mkdir and cd using a single command

Hack 4. Use “cd -” to toggle between the last two directories

Hack 5. Use dirs, pushd and popd to manipulate directory stack

Hack 6. Use “shopt -s cdspell” to automatically correct mistyped directory names on cd

Chapter 2: Date Manipulation

Hack 7. Set System Date and Time

Hack 8. Set Hardware Date and Time

Hack 9. Display Current Date and Time in a Specific Format

Hack 10. Display Past Date and Time

Hack 11. Display Future Date and Time

Chapter 3: SSH Client Commands

Hack 12. Identify SSH Client Version

Hack 13. Login to Remote Host using SSH

Hack 14. Debug SSH Client Session

Hack 15. Toggle SSH Session using SSH Escape Character

Hack 16. SSH Session Statistics using SSH Escape Character

Chapter 4: Essential Linux Commands

Hack 17. Grep Command

Hack 18. Find Command

Hack 19. Suppress Standard Output and Error Message

Hack 20. Join Command

Hack 21. Change the Case

Hack 22. Xargs Command

Hack 23. Sort Command

Hack 24. Uniq Command

Hack 25. Cut Command

Hack 26. Stat Command

Hack 27. Diff Command

Hack 28. Display total connect time of users

Chapter 5: PS1, PS2, PS3, PS4 and PROMPT_COMMAND

Hack 29. PS1 – Default Interaction Prompt

Hack 30. PS2 – Continuation Interactive Prompt

Hack 31. PS3 – Prompt used by “select” inside shell script

Hack 32. PS4 – Used by “set -x” to prefix tracing output

Hack 33. PROMPT_COMMAND

Chapter 6: Colorful and Functional Shell Prompt Using PS1

Hack 34. Display username, hostname and current working directory in the prompt

Hack 35. Display current time in the prompt

Hack 36. Display output of any command in the prompt

Hack 37. Change foreground color of the prompt

Hack 38. Change background color of the prompt

Hack 39. Display multiple colors in the prompt

Hack 40. Change the prompt color using tput

Hack 41. Create your own prompt using the available codes for PS1 variable

Hack 42. Use bash shell function inside PS1 variable

Hack 43. Use shell script inside PS1 variable

Chapter 7: Archive and Compression

Hack 44. Zip command basics

Hack 45. Advanced compression using zip command

Hack 46. Password Protection of Zip files

Hack 47. Validate a zip archive

Hack 48. Tar Command Basics

Hack 49. Combine gzip, bzip2 with tar

Chapter 8: Command Line History

Hack 50. Display TIMESTAMP in history using HISTTIMEFORMAT

Hack 51. Search the history using Control+R

Hack 52. Repeat previous command quickly using 4 different methods

Hack 53. Execute a specific command from history

Hack 54. Execute previous command that starts with a specific word

Hack 55. Control the total number of lines in the history using HISTSIZE

Hack 56. Change the history file name using HISTFILE

Hack 57. Eliminate the continuous repeated entry from history using HISTCONTROL

Hack 58. Erase duplicates across the whole history using HISTCONTROL

Hack 59. Force history not to remember a particular command using HISTCONTROL

Hack 60. Clear all the previous history using option -c

Hack 61. Substitute words from history commands

Hack 62. Substitute a specific argument for a specific command

Hack 63. Disable the usage of history using HISTSIZE

Hack 64. Ignore specific commands from the history using HISTIGNORE

Chapter 9: System Administration Tasks

Hack 65. Partition using fdisk

Hack 66. Format a partition using mke2fsk

Hack 67. Mount the partition

Hack 68. Fine tune the partition using tune2fs

Hack 69. Create a swap file system.

Hack 70. Create a new user

Hack 71. Create a new group and assign to an user

Hack 72. Setup SSH passwordless login in OpenSSH

Hack 73. Use ssh-copy-id along with ssh-agent

Hack 74. Crontab

Hack 75. Safe Reboot Of Linux Using Magic SysRq Key

Chapter 10: Apachectl and Httpd Examples

Hack 76. Pass different httpd.conf filename to apachectl

Hack 77. Use a temporary DocumentRoot without modifying httpd.conf

Hack 78. Increase the Log Level temporarily

Hack 79. Display the modules inside Apache

Hack 80. Show all accepted directives inside httpd.conf

Hack 81. Validate the httpd.conf after making changes

Hack 82. Display the httpd build parameters

Hack 83. Load a specific module only on demand

Chapter 11: Bash Scripting

Hack 84. Execution Sequence of .bash_* files

Hack 85. How to generate random number in bash shell

Hack 86. Debug a shell script

Hack 87. Quoting

Hack 88. Read data file fields inside a shell script

Chapter 12: System Monitoring and Performance

Hack 89. Free command

Hack 90. Top Command

Hack 91. Ps Command

Hack 92. Df Command

Hack 93. Kill Command

Hack 94. Du Command

Hack 95. lsof commands.

Hack 96. Sar Command

Hack 97. vmstat Command

Hack 98. Netstat Command

Hack 99. Sysctl Command

Hack 100. Nice Command

Hack 101. Renice Command

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