52.219 Help

Here is a list of things that we might need for help. I'll try and add to it as I go along, and feel free to send me additions. As an aside, I think we should all attempt to minimise typing. It's slooooooooow, and prone 2o erorrs. Some of the stuff below is aimed at achieving this. Read on :)

EMACS

Start emacs in background: emacs& (NOTE: do this from directory files exist in)

Change Font: control rightmouse, or shift/left-mouse

Run scheme in emacs: meta x run-scheme (meta is beside Alt)

To change buffer: control leftmouse

Delete line: ctl k

next page: ctl v

prev page: meta v

centre on cursor: ctl l

to search for text: ctl s textIwanttofind

to search for text (backwards): ctl r textIwanttofind

cancel command: ctl g (and it will go beep!)

get a file: ctl x ctl f filenameIwant

save file: ctl x ctl s

save file with a name: ctl x ctl

to quit emacs: ctl x ctl c

to replace text: meta x replace-string

set up scheme mode: meta x scheme-mode

Scheme in EMACS

Why bother?

Using scheme in emacs is natural.
They were designed for each other
It becomes easy to close the edit/run loop. We can flip between edit and running a function with ease.
We can minimise typing by being able to redo commands and function calls with simple keystrokes
We get bracket matching on the command line, minimising errors
We can call back previous commands and edit them
minimising typing minimises typing errors and speeds us up.
emacs is scheme's program development environment!

Note

NOTE 1. Make sure you have my init file (/home/s7/pat/scheme/pub/ScmInit.scm) in your home directory: ScmInit.scm

NOTE 2. Always use file with .scm extension, example btree.scm This is because emacs will then recognise this as a scheme file and edit/format it as such

NOTE 3. When typing in source text for a function use line feed to get correct formatting (rather than line feed). Otherwise put mouse on line then hit tab key

NOTE 4. Try and adopt style consistent with that used in the course That is, use cond rather than if, close off function on last line (not many trailing closing brackets), feel free to use set! and do, ignore lambda (use syntactic sugar)

running scheme: meta x run scheme

redo previous line: meta p

go back two lines: meta p meta p

go back three lines: meta p meta p meta p

go forwards one line: meta n

go forwards two lines: meta n meta n

UNIX, some useful stuff

set up tc-shell: tcsh& (gives us ability to repeat and edit commands.)

cd dirname; change directory

cd ~ ; go to top directory

Concatenate files: cat

Copy a file: cp f1 f2

chmod 700 f: gives ME all access

chmod 755 f; gives ME all access, staff read/ex, students read/ex

Difference between two files: diff f1 f2

Direct output to a file: >

Find string in file: grep 'string' fname

head -n file gives first n lines of file

Kill printer file: lpq to get spool number then ... lprm xxx

List all files: ls -a

List files in chrono order: ls -t

List files with long info: ls -l

paste f1 f2 gives new file with f1 before f2 record by record

Pipe to program: |

Print a file on screen: pr [-n] fname (alternatively : page fname)

Print last 10 lines: tail fname

Purge a file: rm fname

Rename a file: mv f1 f2 looks a lot like move file f1 to f2

script filename: trace to filename, terminate with exit

Set bracket matching in vi: set sm

Spelling check: spell f1

Two Up: psnup -2 x.ps > y.ps

tvtwm& fires up window manager

Time and date: date

Who's on: who

Wild cards: * for any number of chars

Wild cards: ? for 1 char

Wild cards: [A-Z] for selection of chars

Word count: wc fname