Bash Introduction

Introduction to the Unix command line

Transcript

1. INTRODUCTION
   BASH
   

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2. ANDRÉ SANTOS
   FRANCISCO NEVES
   62Gerente andreccdr@gmail.com andre-santos.pt
   francisconeves contact@francisconeves.com francisconeves.com
   

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4. UNIX BASED SYSTEMS
   

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5. UNIX BASED SYSTEMS
   STABILITY
   PERFORMANCE
   SCALABILITY
   COMPATIBILITY
   PRICE
   VS WINDOWS
   

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6. BASH?
   ‣WHAT DOES IT MEAN?
   ‣ADVANTAGES?
   WHAT IS
   

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7. BASH?
   ‣AUTOCOMPLETE
   ‣MAN PAGES
   ‣CLEAR SCREEN
   HOW TO DEAL WITH
   

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8. COMMANDS
   SOME REQUIRED
   

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9. LIST ls -a
   -l
   ALL FILES
   LONG FORMAT
   MAKE
   DIRECTORY mkdir [OPT] DIR
   -p MAKE PARENTS
   

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10. CHANGE
    DIRECTORY cd PATH . CURRENT DIR
    ~
    .. PARENT DIR
    HOME DIR
    PRINT WORKING
    DIRECTORY
    pwd
    CREATE
    EMPTY FILE touch FILE
    

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11. COPY cp [OPT] FROM TO
    MOVE OR
    RENAME mv FROM TO
    -r COPY DIRECTORIES RECURSIVELY
    

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12. REMOVE rm [OPT] FILE
    REMOVE
    DIRECTORY rmdir [OPT] DIR
    -r RECURSIVELY REMOVE DIRECTORIES
    -f FORCE
    -p PARENTS
    

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13. CONCATENATE
    AND PRINT FILES
    cat [OPT] FILES
    less [OPT] FILE
    -N NUMBER THE OUTPUT LINES
    VIEW FILE
    -l NUMBER THE OUTPUT LINES
    

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14. FREQUENT COMMANDS
    LESS
    Key COMMAND
    Space NEXT PAGE
    b PREVIOUS PAGE
    j NEXT LINE
    k PREVIOUS LINE
    g FIRST LINE
    G LAST LINE
    G LINE
    Key COMMAND
    / FOWARD SEARCH FOR
    ? BACKWARD SEARCH FOR
    n NEXT SEARCH MATCH
    N PREVIOUS SEARCH MATCH
    = FILE INFORMATION
    h HELP
    q QUIT
    

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15. DISPLAY
    FIRST LINES
    head [OPT] FILE
    tail [OPT] FILE
    -n LAST N LINES
    -n FIRST N LINES
    DISPLAY
    LAST LINES
    

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16. PRINT LINES MATCHING A PATTERN
    grep [OPT] PATTERN [FILE...]
    -c DISPLAY THE NUMBER OF MATCHED LINES
    -i IGNORE CASE SENSITIVITY
    -l DISPLAY THE FILENAMES
    -n DISPLAY THE LINE NUMBERS
    -w MATCH WHOLE WORD
    

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17. WORD COUNT
    wc [OPT] FILE
    -l LINE COUNT
    -c BYTE COUNT
    -m CHARACTER COUNT
    -w WORD COUNT
    

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18. COMMANDS
    CTRL-KEY
    

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19. KILL PROCESS CTRL + C
    STOP PROCESS CTRL + Z
    END OF FILE CTRL + D
    

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20. REDIRECTION
    I/O
    

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21. COMMAND > FILE
    REDIRECT STDOUT TO A FILE
    OVERWRITE
    COMMAND >> FILE
    REDIRECT STDIN TO A FILE
    APPEND
    COMMAND < FILE
    

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22. COMMAND1 | COMMAND2 | COMMAND3
    REDIRECT THE OUTPUT FROM ONE COMMAND AS
    INPUT TO THE NEXT ONE
    

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23. WILDCARDS
    

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24. WHAT ARE
    WILDCARDS?
    

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25. *
    ? ANY SINGLE CHARACTER
    ANY NUMBER OF CHARACTERS
    

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26. SECURITY
    SYSTEM AND
    

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27. PERMISSIONS
    UNIX
    sudo [OPT] [USER] COMMAND
    ALLOWS USERS TO RUN PROGRAMS WITH THE
    SECURITY PRIVILEGES OF ANOTHER USER
    NORMALLY THE ROOT
    

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28. PERMISSIONS
    UNIX
    u
    u
    u g
    g
    g o
    o
    o
    user
    user
    user group
    group
    group others
    others
    others
    r w x r w x r w x
    4 2 1 4 2 1 4 2 1
    a = all
    7
    

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29. CHANGE PERMISSIONS
    chmod [OPT] MODE FILE
    -R RECURSIVELY
    +rx
    g-w
    777
    READ AND EXECUTE FOR ALL
    DENY WRITE ACESS FOR GROUP
    READ, WRITE AND EXECUTE FOR ALL
    

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30. PROCESSES
    UNIX
    COMMAND & RUN PROCESS ON BACKGROUND
    jobs BACKGROUND OR SUSPENDED PROCESSES
    kill SIGNAL PROCESS SEND SIGNAL TO A PROCESS
    killall PROCESS KILL PROCESS BY NAME
    

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31. top
    DISPLAY TOP CPU PROCESSES
    ps
    REPORTS THE PROCESS STATUS
    -e
    FULL LISTING
    ALL PROCESSES
    -f
    

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32. LEAST
    LAST BUT NOT
    

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33. history -c CLEAR
    LAST COMMANDS USED
    time COMMAND
    TIME COMMAND EXECUTION
    diff
    COMPARE FILES LINE BY LINE
    !* LAST MATCHED COMMAND
    

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34. WALK A FILE HIERARCHY
    find PATH [OPT] [EXPRESSION]
    -name FIND BY NAME
    -size FIND BY SIZE
    -iname CASE INSENSITIVE MODE
    

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35. ?
    

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