Linux 101 Hacks

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