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On a Unix-like system, this is easily done by running a command to look at all subdirectories of the current directory: find -mtime -1 -print -xdev On other systems it is harder and requires special software A GNU version of the Unix find utility is available for NT A third reason why a file system can become full is corruption In one instance a Unix disk continued to grow, despite verifying that no new files had been created and after removing all old log files The Unix df disk utility eventually reported that the file system was 130% full (an impossibility) and it continued to grow The eventual cause of this problem was identified as a fault in the file system structure, or inode corruption This was brought about by the host concerned overheating and causing memory errors (system log errors confirmed memory write errors).

You can change the ownership of a file with the command chown. If you are logged in as root, you can issue a command like this:

This changes the ownership of the file file.txt to the user harpo and the group users. To change the ownership of a directory and everything in it, you can use the command with the -R (recursive) option, like this:

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The problem recurred twice before the host was moved to a cooler environment, after which time it righted itself (though the file system had to be repaired with f sck on each occasion) There are many tips for tracing the activity of programs For instance, to trace what files are read by a program, use strace or t r u s s to for watch file descriptors truss -t open, close program This runs the program concerned in a monitor which prints out all the listed system calls This can be a good way of finding out which libraries a program uses (or tries and fails to use), or which configuration files it opens..

Rechenberg reasoned that, since biological processes have been optimized by evolution, and evolution is a biological process itself, then it must be the case that evolution optimizes itself [Rechenberg 1994]. Evolution strategies (ES), piloted by Rechenberg in the 1960s [Rechenberg 1973] and further explored by Schwefel [Schwefel 1975], are then based on the concept of the evolution of evolution. While ESs consider both genotypic and phenotypic evolution, the emphasis is toward the phenotypic behavior of individuals. Each individual is represented by its genetic building blocks and a set of strategy parameters that models the behavior of that individual in its environment. Evolution then consists of evolving both the genetic characteristics and the strategy parameters, where the evolution of the genetic characteristics is controlled by the strategy parameters. An additional difference between ESs and other EC paradigms is that changes due to mutation are only accepted in the case of success. In other words, mutated individuals are only accepted if the mutation resulted in improving the fitness of the individual. Also interesting in ESs is that offspring can also be produced from more than two parents. A general ES algorithm is given in Section 12.1. Representation schemes are discussed in Section 12.2, cross-over is discussed in Section 12.3, mutation in Section 12.4 and selection in Section 12.5.

chown -R harpo:users /home/harpo/some_directory/

The chmod command is also used to change file permissions. You can use chmod with both the numerical and the rwx notation we discussed earlier in the chapter. Again, this is easiest to follow by looking at a few examples: chmod u+x afile Adds execute permissions for the owner of the file chmod g+r afile Adds read permissions for the group owning the file chmod o-r afile Removes read permission for others chmod a+w afile Adds write permissions for all chmod 644 afile Changes the permissions to 644 chmod 755 afile Changes the permissions to 755 If you use chmod with the rwx notation, u means the owner, g means the group, o means others, and a means all. In addition, + means add permissions, and - means remove permissions, while r, w, and x still represent read, write, and execute, respectively. When setting permissions, you can see the translation between the two notations by executing the chmod command with the -v (verbose) option. For example:

Complete your own list of troubleshooting tips. This is a list you will be building for the rest of your life.

chmod -v 755 afile mode of `afile changed to 0755 (rwxr-xr-x) chmod -v 200 afile mode of `afile changed to 0200 (-w-------)

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