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linux下编程入门及代码

Chapter 4  -  The UNIX Environment.


args.c     -  A program that splits command-line options from arguments.

argopt.c   -  An extended version of args.c that flags up illegal options and that expects arguments 
following some options.

environ.c  -  A program that prints out the values of environment variables.

showenv.c  -  A program that prints out all the environment variables with their current values.

envtime.c  -  A program that prints the low level time value every 2 seconds for 20 seconds.

gmtime.c   -  A program that prints human time.

ctime.c    -  A program that prints the local time.

strftime.c -  A program that gives the user more control over the look of the time output.

tmpnam.c   -  A progam that creates a unique temporary file.

user.c     -  A program that prints information about the user from password file.

hostget.c  -  A program that prints information about the host computer.

syslog.c   -  A program that writes message to syslog on error.

logmask.c  -  A program that uses logmask to log only messages of a certain priority.  
(Needs Linux kernels later than 1.2.11.)

limits.c   -  A program that pushes resource to their limits.