Environment VariableDescription$HOMEThe home directory of the current user. (Web server logs)
Environment VariableDescription$HOMEThe home directory of the current user. $PATHAcolon-separated list of directories to search for commands. $PS1Acommand prompt, frequently $, but in bash you can use somemore complex values; for example, the string [u@h W]$is apopular default that tells you the user, machine name, and currentdirectory, as well as giving a $ prompt. $PS2Asecondary prompt, used when prompting for additional input; usually >. $IFSAn input field separator; a list of characters that are used to sepa- rate words when the shell is reading input, usually space, tab, andnewline characters. $0The name of the shell script. $#The number of parameters passed. $$The process ID of the shell script, often used inside a script forgenerating unique temporary filenames; for example /tmp/tmp- file_$$. Parameter VariablesIf your script is invoked with parameters, some additional variables are created. Even if no parametersare passed, the preceding environment variable $#still exists but has a value of 0. The parameter variables are listed in the following table. Parameter VariableDescription$1, $2, …The parameters given to the script. $*Alist of all the parameters, in a single variable, separated by the firstcharacter in the environment variable IFS. $@Asubtle variation on $*; it doesn t use the IFS environment variable, so parameters may be run together if IFS is empty. If you want to check out how the program works in a different environment by run- ning the env
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