Essential Books

PATH

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The search path for finding binaries for commands. Common examples include /usr/bin and /usr/local/bin.

When a user or script attempts to run a command, the paths in $PATH are searched in order to find a matching file with execute permission.

The directories in $PATH are separated by a : character. 

~> $ echo "$PATH"
/usr/kerberos/bin:/usr/local/bin:/bin:/usr/bin

So, for example, given the above $PATH, if you type lss at the prompt, the shell will look for /usr/kerberos/bin/lss, then /usr/local/bin/lss, then /bin/lss, then /usr/bin/lss, in this order, before concluding that there is no such command.

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Internal variables:
* Internal variables
* Bash internal variables at a glance
*
*
* HOME
* etc...
*
* FUNCNAME
*
*
* PWD
* HISTSIZE
* IFS
*
* OLDPWD
* PATH
* OSTYPE
* MACHTYPE
* PPID
* HOSTTYPE
* SECONDS
* SHELLOPTS
* HOSTNAME
* EDITOR
* BASH VERSION
* BASH VERSINFO
* BASH ENV
* BASHPID
*
* RANDOM
* SHLVL
* LINENO
* GROUPS
* UID
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