Lab46 Wiki

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__Basic commands to move around in UNIX.__

Move a File: mv filename directorypath

copy a file: cp filename directorypath

rename a file: mv filename newfilename

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__compression notes :__

to do a zip extract: “unzip filename.zip” (files within should come out exported to the current directory.)

Tar is an archive format that can do .tar, .tar.gz, .tar.bz2, and .tar.xz

Extract .tar: tar -xvf file.tar

Extract .tar.gz: tar -xzvf file.tar.gz

Extract .tar.bz2: tar -xjvf file.tar.bz2

Extract .tar.xz: tar -xJvf file.tar.xz (Doing a J instead of j will signal its a .xz end.)

To create any .tar file compression: tar -cvf file.tar(add .gz, .bz2, .xz) /file directory to encapsulate

What the letters mean in before the file export.

- x means to extract a tar file

- v means show progress while extracting

- f means specify an archive/file

- j extract a .bz2 file

- J extract a .xz file

- decompress files of a .gz extension

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__Variables__

Set the variable: t=“what” (so it saves)

Execute and see it: echo “$t” (should say what t was set to)

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__Text Manipulation__

Rev command (Reverses text in a file): rev filename > exportedfile

Tac Command (flips the text from up to down. Usually helps if your document looks upside down)

tac: tac filename > exportfilename


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__Wild Cards__

Symbols that represent different symbols.

__Wild card symbols__

- * - Kleene Star; match 0 or more symbols.

- ? - Match 1 of any symbol

- [] - Character class; match 1 of any of enclosed symbols.

- [^]- Inverted character class; do not match 1 of any of enclosed symbols.

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__Cut Command__

If you wanted a specific row to cut out of a text document.

cut -c x (x meaning how many bits) filename > export filename

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__Head Command__

This is to show parts of the document from the top end.

head -n x (x meaning how many rows to show from the top) filename > export.

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__Tail Command__

To show text or data in a document to show from bottom of the document to the specified row height.

tail -n x (x meaning how many rows to show from the bottom) filename >export

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__get any conversions to a different base.__

For base 2. (binary)

command : echo “obase=2;[number]” | bc

For base 8. (octal)

command : echo “obase=8;[number]” | bc

For base 10. (decimal)

command : echo “obase=10;[number]” | bc

For base 16. (hexidecimal)

command : echo “obase=16;[number]” | bc

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__chmod utilities__

__MAKE A FILE AN EXECUTABLE__

command : chmod 0700 filename

__Make a file readable__

command : chmod 0600 filename

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