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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