UNIX QUICK REFERENCE

Directory tree from my home directory:

/home/usra/64/25640 
     essay_dec05.doc, naep.lst, naep.sas
     /mail
          mailfile1, mailfile2, ...
     /workfiles
          file1, file2, ...
     /public_html 
          index.html, anotherwebpage.html, myphoto.gif, ...
          /proj1
               index.html, map1a.gif, map1b.gif, ...
          /proj2
               index.html, map2a.gif, map2b.gif, ...

Detailed listing of my home directory:
-rw-r--r--   1 johnmack 0419       27648 Dec 11  2005 essay_dec05.doc
drwx------   2 johnmack 3896        4096 Apr 13  1998 mail
-rw-------   1 johnmack 0419        1610 Sep 25 11:52 naep.lst
-rw-r--r--   1 johnmack 0419        1677 Sep 25 11:52 naep.sas
drwxr-xr-x   4 johnmack 3896        4096 Sep  5 12:38 public_html
drwx------   1 johnmack 0419        4096 Mar 27  2000 workfiles

first 10 characters in detailed listing 
1  - file, d directory
2-4  read/write/execute permissions for file owner, - not permitted
5-7  rwx permissions for UNIX group, - not permitted
8-10 rwx permissions for other users, - not permitted


BASIC COMMANDS

Command                      Description

pwd                          echo current directory path
cd                           change to home directory
cd ..                        change to parent of current directory
cd subdir                    change to subdirectory subdir
ls                           list directory contents (filenames only)
ls -1                        list directory contents (permissions, owner, size, when created, filename)

mkdir subdir                 create a new subdirectory subdir
rmdir subdir                 remove empty subdirectory subdir
rm file1                     remove file1 
mv file1 dir1                move file1 to existing subdirectory dir1
mv oldname newname           rename oldname as newname 
mv "my file" file2           use quotes to rename a file with spaces in the name
cp origfile copyfile         copy origfile as copyfile

chmod 754 file1              change mode (set permissions) of file1   
                             read=4 write=2 execute=1; each digit is sum of permissions:
                             here 7=rwx for owner; 5=r-x for group; 4=r-- for others.

quota -v                     display disk usage and quotas
passwd                       change password