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As you can guess from the discussion of command history in the previous section, the bash shell maintains a significant amount of information about the commands that it has executed, the settings for various configuration parameters, the environment in which it is operating, and so on. Much of this information is stored in variables in the shell environment, which are therefore known as environment variables. You can display all of the environment variables set within your current shell and their definitions by typing the printenv command, as in the following example:

Cfengine has an intelligent locking and timeout policy which should be sufficient to handle hanging shell commands from previous crons so that no overlap can take place. 7.4.5 A Generalized Scripting Language: Perl

$ printenv HOSTNAME=home.vonhagen.org TERM=xterm SHELL=/bin/bash HISTSIZE=1000 WINDOWID=31457294 ENSCRIPT=-r2G PRINTCMD=enscript -r2G PATH=/home/wvh/bin:/opt/timesys/timestorm/2.4.1:/usr/local/firefox:/usr/local/bi n:/usr/local/Acrobat5/bin:/home/wvh/cxoffice/bin:/opt/OpenOffice.org1.1.0:/usr/l ocal/textmaker:/usr/java/bin:/usr/sbin:/sbin:/usr/kerberos/bin:/bin:/usr/bin:/us r/X11R6/bin INPUTRC=/etc/inputrc PWD=/home/wvh/personal/writing/SUSE/OLD JAVA_HOME=/usr/java LANG=en_US.UTF-8 PS1=[\u@\h:\W]\$

Customization of the system requires us to write programs to perform special tasks. Perl was the first of a group of scripting languages including python, tcl and scheme, to gain

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As you can see from this example, the names of environment variables typically comprise uppercase and underscore characters and are used in a variety of ways For example, the value of the HOME environment variable is a single string that contains the name of a user s home directory The PATH environment variable is a colon-separated list of directories that the shell searches in order when looking for a command that you have executed The PS1 environment variable defines the structure and content of the prompt that is displayed by the shell The _ environment variable (the last line of the code example) holds the full pathname of the last command executed within the shell in this case, that of the printenv command you just ran Environment variables can be set in a number of places: System-wide configuration files such as those located in /etc/profile, /etc/ profile.

8. If Ak < 0.25 then increase the scale parameter to \k = 4Ak. 9. If the steepest descent direction rk 0 then set k = k + 1 (i.e. go to the next epoch) and go to step 2, else terminate and return wk+1 as the desired minimum.

local, and the directory /etc/profiled on a Linux system These are system-wide files that are executed to help initialize your working environment each time you log in System-wide configuration files such as /etc/bashrc These are typically executed by a user s personalized bash configuration file each time that you start a new shell and set system-wide shell configuration variables User-specific configuration files such as bashrc that are read each time you start a new shell Within shell scripts for use within those scripts or to be exported back to the commandline environment From the command line for your convenience or within shell functions executed by the shell Environment variables that you want to make available to all subsequent shells are made available to the parent shell using the export command.

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