Lab46 Wiki

1) Do one thing and do that one thing extremely well

2) Small is beautiful

3) Everything is a file.

1. 3 Types of Files
2. Regular/ordinary files: in Unix these are seen with ls -l as a: -
3. Directory files: in Unix these are seen with ls -l as a: d
4. Special files/device files: in Unix these are seen with ls -l as a: l

ls -l -/—/—/— information First dash: type of file. See above. First Group: Owner Perms. Second Group: Group Perms. Third Group: Global Perms.

Base 8 understanding for file Perms

1. # [letter] [what it does]
2. 4 r read
3. 2 w write
4. 1 x execute
5. 0 - nothing

1. [Command] [Name] [What it does]
2. man: Manual: Gives an index of a command. Format: man [command] [options]
3. ls: list: Gives a list of all non-hidden items in the current directory. Format: ls [options]
4. cd: change directory: changes the current directory. Format: cd [directories in current directory/.. (go up one parent)/a specific directory if you know the location]
5. mv: move: (not sure what it does, man mv showed that it changes cursor location)
6. cp: copy: copy files over from one location to another. Format: cp [source] [destination]
7. mkdir: make directory: creates directories. Format: mkdir [name of new directory] (can make it in specific directories, or just in the current one)
8. echo: echo: overwrite files with written text/prints whatever you say after it. Format: echo [> (overwrite)/» (add to) + filename] [What you wish to write]
9. cat: cat: reads targeted file. Format: cat [filename]
10. unzip: unzip: unzips .zip
11. gzip: gz unzip: removes .gz from compressed files.
12. tar: tar: extracts tar files, used like this : tar -xf (add a z to that if gz is still there, j if it's a bz2) filename
13. tr: translate: changes characters in a file from One char into another Format: tr “X” “Y”