@@ -25,15 +25,15 @@ This course offers a systematic and comprehensive introduction to Linux, designe
2525|  05 |  🎯 🆓 Delete and Move Files |  Beginner |  <a  target =' _blank '  href =' https://labex.io/tutorials/linux-delete-and-move-files-7777 ' >Start Challenge</a > | 
2626|  06 |  📖 🆓 Linux User Group and File Permissions |  Beginner |  <a  target =' _blank '  href =' https://labex.io/tutorials/linux-linux-user-group-and-file-permissions-18002 ' >Start Lab</a > | 
2727|  07 |  🎯 🆓 Add New User and Group |  Beginner |  <a  target =' _blank '  href =' https://labex.io/tutorials/linux-add-new-user-and-group-17987 ' >Start Challenge</a > | 
28- |  08 |  📖 🆓  File and Directory Operations |  Beginner |  <a  target =' _blank '  href =' https://labex.io/tutorials/linux-file-and-directory-operations-17997 ' >Start Lab</a > | 
29- |  09 |  🎯 🆓  Find a File |  Beginner |  <a  target =' _blank '  href =' https://labex.io/tutorials/linux-find-a-file-17993 ' >Start Challenge</a > | 
30- |  10 |  📖 🆓  Environment Variables in Linux |  Beginner |  <a  target =' _blank '  href =' https://labex.io/tutorials/linux-environment-variables-in-linux-385274 ' >Start Lab</a > | 
28+ |  08 |  📖 File and Directory Operations |  Beginner |  <a  target =' _blank '  href =' https://labex.io/tutorials/linux-file-and-directory-operations-17997 ' >Start Lab</a > | 
29+ |  09 |  🎯 Find a File |  Beginner |  <a  target =' _blank '  href =' https://labex.io/tutorials/linux-find-a-file-17993 ' >Start Challenge</a > | 
30+ |  10 |  📖 Environment Variables in Linux |  Beginner |  <a  target =' _blank '  href =' https://labex.io/tutorials/linux-environment-variables-in-linux-385274 ' >Start Lab</a > | 
3131|  11 |  🎯 Configure Linux Environment Variables |  Beginner |  <a  target =' _blank '  href =' https://labex.io/tutorials/linux-configure-linux-environment-variables-437861 ' >Start Challenge</a > | 
3232|  12 |  📖 File Packaging and Compression |  Beginner |  <a  target =' _blank '  href =' https://labex.io/tutorials/linux-file-packaging-and-compression-385413 ' >Start Lab</a > | 
3333|  13 |  🎯 Backup System Log |  Beginner |  <a  target =' _blank '  href =' https://labex.io/tutorials/linux-backup-system-log-17989 ' >Start Challenge</a > | 
3434|  14 |  📖 File System and Disk Management |  Beginner |  <a  target =' _blank '  href =' https://labex.io/tutorials/linux-file-system-and-disk-management-17999 ' >Start Lab</a > | 
3535|  15 |  🎯 Analyzing Disk Usage |  Beginner |  <a  target =' _blank '  href =' https://labex.io/tutorials/linux-analyzing-disk-usage-7775 ' >Start Challenge</a > | 
36- |  16 |  📖 🆓  Sequence Control and Pipeline |  Beginner |  <a  target =' _blank '  href =' https://labex.io/tutorials/linux-sequence-control-and-pipeline-17994 ' >Start Lab</a > | 
36+ |  16 |  📖 Sequence Control and Pipeline |  Beginner |  <a  target =' _blank '  href =' https://labex.io/tutorials/linux-sequence-control-and-pipeline-17994 ' >Start Lab</a > | 
3737|  17 |  🎯 Space Battle Data Pipeline |  Beginner |  <a  target =' _blank '  href =' https://labex.io/tutorials/linux-space-battle-data-pipeline-385343 ' >Start Challenge</a > | 
3838|  18 |  📖 Simple Text Processing |  Beginner |  <a  target =' _blank '  href =' https://labex.io/tutorials/linux-simple-text-processing-18004 ' >Start Lab</a > | 
3939|  19 |  🎯 Analyzing PATH Directories |  Beginner |  <a  target =' _blank '  href =' https://labex.io/tutorials/linux-analyzing-path-directories-385344 ' >Start Challenge</a > | 
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