Comp 2673
Spring 2002
Homework 1 solutions

3. The -b flag for diff ignores repeating blanks and end-of-line blanks. In other words, if one file has extra spaces in the middle of a line or at the end, then diff sees them as the same. To compare the two programs, ignoring all differences in case and white space, say
   % diff -wi Janeprogram.cpp Martinprogram.cpp
4. % grep apple ~ftl/foodir/*
   The word "apple" shows up in foo18, foo23 and foo9
5. The permissions are rwx---r-x, which means the the owner can read, write, and execute, group members have no permissions, and others can read and execute.
6. type env, and look at the value of the PATH environment variable. It gives the list of directories searched when you enter a command. These can be changed, but for new users are set to: /usr/local/bin
   /usr/ccs/bin
   /usr/bin
   /usr/dt/bin
   /usr/X/bin
   /usr/X/demo
   /usr/ucb
   /usr/local/scripts
   /usr/local/maple/bin
   /usr/local/perl/bin
   /usr/local/tex/bin
   /u/home/yourusername/bin
   . (your current directory)
   
7. % du /usr/bin
   Multiply by 512 to get total number of bytes. On evans, for example, we have 18542x512 bytes.