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35 Cards in this Set
- Front
- Back
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Terminal (shell) |
program that reads user input from the command line and executes actions based on that input Functions: -1)communicate directly w/ the computer -2)Navigate through the directories |
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command line |
to execute a command |
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directory |
folder |
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Path Name |
Is a path and a name that lists the directories that it takes to get to a specific destination
-includes base name |
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Absolute Path |
Path that begins at root -always unique |
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Relative Path |
Path that begins at the cwd -no root, not unique |
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Argument |
a modifier to a command |
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Script |
Text based file with instructions for the computer to do something, written in a particular coding language. -scripts are programs but long enough to be considered one -evaluated top to bottom |
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Program |
Text based file with instructions for the computer to do something, written in a particular coding language. -long scripts. |
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Bash |
Language of the terminal |
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Python Mel Renderman Shading Language |
coding languages we'll use in our industry |
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bin |
Folder that holds commands and executables |
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Math in the Terminal |
•With the let command -You have to set up variables -ex: let VarA=VarB-Varc •With $(()) -ex: echo $((1+)) -Symbols: /,*,+,- |
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$PATH |
Lists directories where executables exist in linux -there are specific folders in looks into -to run this: echo $PATH -enivronmental variable |
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Variable |
A container for a given value |
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Variable Assignment |
Giving contents to a variable (can be reassigned)
No "$" is necessary when assigning the value -ex: VARIABLE=value or VARIABLE="value" |
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Variable Expansion |
Accessing contents of a variable "$" is necessary to expand variable -ex: echo "$VARIABLE" |
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Variable Declaration
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to specify a variable's data type
-by default bash assumes the data type is string |
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Notes w/ Variables |
•These are inputs and their outputs ·Assuming NAME=Bob -echo "$NAME" Bob --the quotes expand the variable -echo '$NAME' $NAME --variable not expanded -echo "\$NAME" $NAME -echo "\\$NAME" \$NAME |
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Environmental Variable |
Global, known in all terminals, access from anywhere, not unique to linux -inputing "env" will show you all environmental variables -$PATH -"$NETHOME" is the variable for your stuhome (use cd $NETHOME to get to your stuhome) |
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Data type |
Kind of information, a type of data -Bash only has threes types: string, array, integer |
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String |
Data type Characters typed in or text. Needs quotations |
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Integer
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Data Type A whole number, no decimal places (otherwise, its a float) -Allows you to do math |
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Array
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A sequence of items -can be used with the "for" command -Are ordered and the items are indexed starting at "0" -Can assign and access individual members |
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Float |
Number with decimal places -not technically able to exist in bash though there is a way around it. |
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Increment |
to increase by a fixed amount, repectively |
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Pseudo Code |
Mix of coding language and regular language to create a blue print for a script |
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Techniques for workflow/debugging |
-version up -divide and conquer -start small, get it to work before writing a ton -test it constantly |
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Branching |
-Done with "if" statements -condition is needed |
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Conditional |
Evaluates to true or false and controls the flow of the script |
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"IF" statements |
The conditions go in brackets and the command is ended with "fi". Can be used for flow control. The four types: -if -if/else (typed: else) -if/else if... (elif), can evaluate two or more conditions -if/else if.../else |
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Flow Chart |
Diagram, no code, showing what can happen on a script |
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Iterate |
to say or do again and again |
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Expletive |
curse word |
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Anathema |
Something/one that is detested or loathed |
