Linux 101 Hacks 2nd edition
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Hack 28. Display total connect time of users
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2020-04-04 08:45:42
Hack 28. Display total connect time of users
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Chapter 1: Powerful CD Command Hacks
Hack 2. Use cd alias to navigate up the directory effectively
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
Hack 4. Use “cd -” to toggle between the last two directories
Hack 3. Perform mkdir and cd using a single command
Hack 1. Use CDPATH to define the base directory for cd command
Chapter 10: Apachectl and HTTPD Examples
Hack 79. Display the modules inside Apache
Hack 82. Display the httpd version and build parameters
Hack 76. Pass different httpd.conf filename to apachectl
Hack 77. Use a temporary DocumentRoot without modifying httpd.conf
Hack 83. Load a specific module only on demand
Hack 81. Validate the httpd.conf after making changes
Hack 78. Increase the Log Level temporarily
Hack 80. Show all accepted directives inside httpd.conf
Chapter 11: BASH Scripting
Hack 87. Single Quote and Double Quote Inside Shell Script
Hack 88. Read data file fields inside a shell script
Hack 86. How to Debug a shell script
Hack 84. Execution Sequence of .bash_* files
Hack 85. How to generate random number in bash shell
Chapter 12: System Monitoring and Performance
Hack 90. Top Command Examples
Hack 92. Df Command Examples
Hack 91. Ps Command Examples
Hack 95. lsof Command Examples
Hack 93. Kill Command Examples
Hack 89. Free command examples
Hack 96. Sar Command Examples
Hack 94. Du Command Examples
Hack 99. Sysctl Command Examples
Hack 100. Nice Command Examples
Hack 98. Netstat Command Examples
Hack 101. Renice Command Examples
Hack 97. vmstat Command Examples
Chapter 13: Bonus hacks
Compare Two Files Using Comm
Rar Command Usage Examples
OD Command Usage Examples
Create an ISO file from a CD or DVD
Tee Command Usage Examples
DVD Operations in Linux
Gpg Key-Pair Encryption and Decryption Examples
Make cd command Arguments Case Insensitive
Compact-Disk (CD) Operations in Linux
Specify Password Only Once for Multiple SSH Connections
Chapter 2: Date Manipulation
Hack 11. Display Future Date and Time
Hack 9. Display Current Date and Time in a Specific Format
Hack 8. Set Hardware Date and Time Using hwclock
Hack 7. Set System Date and Time
Hack 10. Display Past Date and Time
Chapter 3: SSH Client Commands
Hack 12. Identify SSH Client Version
Hack 14. Debug SSH Client Session
Hack 16. SSH Session Statistics using SSH Escape Character
Hack 13. Login to Remote Host using SSH
Hack 15. Toggle SSH Session using SSH Escape Character
Chapter 4: Essential Linux Commands
Hack 20. Join Command Examples
Hack 27. Diff Command Examples
Hack 25. Cut Command Examples
Hack 23. Sort Command Examples
Hack 22. Xargs Command Examples
Hack 26. Stat Command Examples
Hack 21. Change the Case Using tr Command
Hack 18. Find Command Examples
Hack 19. Suppress Standard Output and Error Message
Hack 28. Display total connect time of users
Hack 24. Uniq Command Examples
Hack 17. Grep Command Examples
Chapter 5: Linux Prompts
Hack 29. PS1 – Default Interaction Prompt
Hack 31. PS3 – Prompt used by “select” inside shell script
Hack 33. PROMPT_COMMAND
Hack 32. PS4 – Used by “set -x” to prefix tracing output
Hack 30. PS2 – Continuation Interactive Prompt
Chapter 6: Colorful Shell Prompt Using PS1
Hack 41. Create your own prompt using the available codes for PS1 variable
Hack 40. Change the prompt color using tput
Hack 34. Display username, hostname and basename of directory in the prompt
Hack 36. Display output of any command in the prompt
Hack 42. Use bash shell function inside PS1 variable
Hack 37. Change foreground color of the prompt
Hack 35. Display current time in the prompt
Hack 38. Change background color of the prompt
Hack 43. Use shell script inside PS1 variable
Hack 39. Display multiple colors in the prompt
Chapter 7: Archive and Compression
Hack 49. Combine gzip, bzip2 with tar
Hack 47. Validate a zip archive
Hack 44. Zip command basics
Hack 48. Tar Command Basics
Hack 45. Advanced compression using zip command.
Hack 46. Password Protection of Zip files
Chapter 8: Command Line History
Hack 64. Ignore specific commands from the history using HISTIGNORE
Hack 55. Control the total number of lines in the history using HISTSIZE
Hack 59. Force history not to remember a particular command using HISTCONTROL
Hack 60. Clear all the previous history using option -c
Hack 53. Execute a specific command from history
Hack 63. Disable the usage of history using HISTSIZE
Hack 58. Erase duplicates across the whole history using HISTCONTROL
Hack 51. Search the history using Control+R
Hack 61. Substitute words from history commands
Hack 54. Execute previous command that starts with a specific word
Hack 52. Repeat previous command quickly using 4 different methods
Hack 57. Eliminate the continuous repeated entry from history using HISTCONTROL
Hack 62. Substitute a specific argument for a specific command
Hack 50. Display TIMESTAMP in history using HISTTIMEFORMAT
Hack 56. Change the history file name using HISTFILE
Chapter 9: System Administration Tasks
Hack 71. Create a new group and assign to an user
Hack 66. Format a partition using mke2fsk
Hack 67. Mount the partition
Hack 72. Setup SSH passwordless login in OpenSSH
Hack 69. Create a swap file system.
Hack 65. Partition using fdisk
Hack 74. Crontab Basic Guide
Hack 70. Create a new user
Hack 73. Use ssh-copy-id along with ssh-agent
Hack 68. Fine tune the partition using tune2fs
Hack 75. Safe Reboot Of Linux Using Magic SysRq Key
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