How can I tell what bash script I have?
If you use that scriptlet often, put it in a script. Then, you can identify the script name in the process list. If I do bash -c “while true; do make -s foo.ps; sleep 2; done” , then the bash command command shown by ps has the filename I need to identify the script.
How do I check if a previous run was successful in bash?
To get the value, run this command. $ echo $? If a command succeeded successfully, the return value will be 0. If the return value is otherwise, then it didn’t run as it’s supposed to.
How to check the default shell in Bash?
If you just want to ensure the user is invoking a script with Bash: $SHELL need not always show the current shell. It only reflects the default shell to be invoked. To test the above, say bash is the default shell, try echo $SHELL, and then in the same terminal, get into some other shell ( KornShell (ksh) for example) and try $SHELL.
How to know the script file name in a bash?
To answer Chris Conway, on Linux (at least) you would do this: readlink prints out the value of a symbolic link. If it isn’t a symbolic link, it prints the file name. -n tells it to not print a newline. -f tells it to follow the link completely (if a symbolic link was a link to another link, it would resolve that one as well).
How to determine the name of a function in Bash?
The bottom-most element (the one with the highest index) is “main”. This variable exists only when a shell function is executing. Assignments to FUNCNAME have no effect and return an error status. If FUNCNAME is unset, it loses its special properties, even if it is subsequently reset. This variable can be used with BASH_LINENO and BASH_SOURCE.
How to find out what version of Bash I’m using?
There are many ways to find out the shell and its corresponding version. Here are few which worked for me. $> echo $0 (Gives you the program name. In my case the output was -bash .) $> $SHELL (This takes you into the shell and in the prompt you get the shell name and version.