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copied table 5.1, which covers basic shell built-in variables

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tomit4 2022-05-07 16:11:26 -07:00
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unix_programming_environment/shell_built_in_variables.txt Normal file
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-------------------------- Table 5.1 --------------------------
$# the number of arguments
$* all arguments to shell
$@ similar to $*; see Section 5.7
$- options supplied to shell
$? return value of the last command executed
$$ process-id of the shell
$! process-id of the last command started with &
$HOME default argument for cd command
$IFS list of characters that separate words in arguments
$PATH list of directories to search for commands
$PS1 prompt string, default '$ '
$PS2 prompt string for continued command line, default '> '