Useful Unix commands for CS 322

Useful Unix commands for CS 322 students using lex and yacc

Shamelessly cribbed from Stanford.

ls --- lists your files
emacs filename & --- is an editor that lets you create and edit a file. See the emacs page.
mv filename1 filename2 --- moves a file (i.e. gives it a different name, or moves it into a different directory (see below)
cp filename1 filename2 --- copies a file
rm filename --- removes a file. It is wise to use the option rm -i, which will ask you for confirmation before actually deleting anything. You can make this your default by making an alias in your .cshrc file.
chmod options filename --- lets you change the read, write, and execute permissions on your files. The default is that only you can look at them and change them, but you may sometimes want to change these permissions. For example, chmod o+r filename will make the file readable for everyone, and chmod o-r filename will make it unreadable for others again. Note that for someone to be able to actually look at the file the directories it is in need to be at least executable. See help protection for more details.

mkdir dirname --- make a new directory
cd dirname --- change directory. You basically 'go' to another directory, and you will see the files in that directory when you do 'ls'. You always start out in your 'home directory', and you can get back there by typing 'cd' without arguments. 'cd ..' will get you one level up from your current position. You don't have to walk along step by step - you can make big leaps or avoid walking around by specifying pathnames.
pwd --- tells you where you currently are.