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7 Other Useful Commands

df: shows file space and mounted systems.
ps aux: shows processes running. ps ax is a narrower form.
rm filename: remove filename.
rm -R dir: removes a directory dir and all subdirectories--careful!
ls -R: lists files in the current directory and all subdirectories; I used a variant, ls -AFR > where.txt, to get a list of all the files in / and (separately) /usr before I found better ways to find files.
passwd: to change user's password (or root's password)
man hier: manual page on the Unix filesystem

Use find to locate filename in /usr or any of its subdirectories with

    % find /usr -name "filename"

You can use * as a wildcard in "filename" (which should be in quotes). If you tell find to search in / instead of /usr it will look for the file(s) on all mounted filesystems, including the CDROM and the DOS partition.

An excellent book that explains Unix commands and utilities is Abrahams & Larson, Unix for the Impatient (2nd ed., Addison-Wesley, 1996). There is also a lot of Unix information on the Internet. Try the Unix Reference Desk.

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