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$? expands to the exit status of the most recently executed foreground pipeline. See the Special Parameters section of the Bash manual. In simpler terms, it's the exit status of the last command.

stat from GNU coreutils can do this: stat -c '%U' /path/of/file/or/directory Unfortunately, there are a number of versions of stat, and there's not a lot of consistency in their syntax. For examp …

Use basename: #!/bin/bash basename -- "$0" If you want to assign it to a variable, you'd do: my_name=$(basename -- "$0")

This has to be a shell function, not a script, because a script executes in a new shell (and thus can't change the directory of the original shell). function cdroot() { while [[ $PWD != '/' && ${PW …

As explained in 6.2 Bash Startup Files, ~/.profile is executed when you start an interactive login shell (or use the --login option). Since tmux's default behavior is to start a login shell in each n …

If all you need is to unset LD_LIBRARY_PATH after loading Emacs, just add (setenv "LD_LIBRARY_PATH") to ~/.emacs or other init file. If you need to swap back and forth, save the result of (getenv …

This isn't a direct answer to the question, but I fell in love with the directory history window in 4DOS. So much so that I wrote my own version for Linux (and Cygwin). I've never gotten around to m …

su starts a new shell (or runs some other command). It doesn't magically switch the UID of the current shell. If you type exit after entering your password, you'll see that your script continues wit …