bash

# bash bashLT is a simple shell, a baby brother of the Bourne-again shell bash, and offers a limited subset of bash's functionality: - execution of simple commands with zero or more arguments - definition of local environment variables (NAME=VALUE) - redirection of the standard input (<, <<) - redirection of the standard output (>, >>) - execution of pipelines (sequences of one or more simple commands or subcommands separated by the pipeline operator |) - execution of conditional commands (sequences of one or more pipelines separated by the command operators && and ||) - execution of sequences of one or more conditional commands separated by the command terminators ; and & and possibly terminated by ; or & - execution of commands in the background (&) - subcommands (commands enclosed in parentheses that act like a single, simple command) - reporting the status of the last simple command, pipeline, conditional command, or subcommand executed by setting the environment variable $? to its "printed" value (e.g., the string "0" if the value is zero). - directory manipulation: cd -p Print current working directory to the standard output. cd DIRNAME Change current working directory to DIRNAME. cd Change current working directory to $HOME, where HOME is is an environment variable. - other built-in commands: export NAME=VALUE Set environment variable NAME to VALUE. export -n NAME Delete environment variable NAME. wait Wait until all child processes of the shell process have died. The status is 0. Once the command line has been parsed, the exact semantics of bashLT are those of bash, except for the status variable and the items noted below