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    Introduction - welcome!
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    pwd
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    cd
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    ls
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    mkdir
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    touch
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    date
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    cat
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    rm + rmdir
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    cp
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    mv
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    wc
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    grep
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    find
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    Scripting - what it is all about?
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    Invoking the script
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    Sha-bang!
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    Using variables in scripts
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    Explicit definition - showcase
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    Read command
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    command substitution + time measurement
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    Math calculation
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    Math Calculation - showcase
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    Playing with $ : arguments, arguments, arguments
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    More on arguments - playing with IFS and assigning arguments value to a variable
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    Redirection and Piping
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    Redirection and Piping - showcase
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    Exit status
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    Explaining IF
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    Mathematical comparisons
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    String comparisons
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    String comparison - you are not root??
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    Wildcards
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    Wildcards - making linux command badass
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    Wildcards - create backup script
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    Regular expressions
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    Regular expressions - is there any reachable ip address ??
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    Filesystem related tests
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    Filesystem related tests - testing files permissions
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    && and || - making IF statement shorter
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    Explaining for loop
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    Add commands output into all .txt files
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    Looping through all script arguments: "$@" or "$*" ??
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    Explaining while loop
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    Making own cat command with line numbering
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    Explaining case
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    Recheck users input
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    Creating script with parameters [-f file] [--file file] [-h] [--help]
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    (NEW) Manual Parsing vs Getopts vs Getopt
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    (NEW) Getopts - showcase script
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    (NEW) Getopt - showcase script
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    Explaining Array
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    Array - storing output of command into array and making some fun with its items
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    Explaining Functions
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    Making addition in a function
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    Explaining AWK
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    print, BEGIN{}, {}, END{}
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    $1, $2, dollars everywhere
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    searching pattern
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    NF - number of fields
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    NR - number of records
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    FS - field separator
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    RS - record separator
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    variable assignment
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    if-else
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    for loop
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    Building script with AWK
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    AWK script PART 1 - reading arguments
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    AWK script PART 2 - was the location set?
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    AWK script PART 3 - searching for specific extension
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    AWK script PART 4 - what about not existing extension?
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    AWK script PART 5 - counting size of files using awk
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    AWK script PART 6 - setting largest and smallest file
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    AWK script PART 7 - printing statistics
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    AWK script PART 8 - reading awk part from separate file
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    Explaining SED
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    p - print command and -n option
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    a append/ i prepand
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    d - delete command
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    c - change command
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    q - quit command
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    -e option Run multiple sed commands
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    -i option Changing files for sure
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    e - perform shell commands
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    Explaining s - substitute command
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    s - substitute command showcase
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    Building script with SED
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    SED script PART 1 - structure for reading arguments
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    SED script PART 2 - fixing space/tab issues
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    SED script PART 3 - printing lines which don't have space/tab issues
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    SED script PART 4 - line numbering
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    SED script PART 5 - show spaces/tabs as a red background
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    SED script PART6 - show spaces/tabs also at the end of lines
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    SED script PART 7 - just to print it nicely