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Setting a text editor for visudo

As you know, the recommended way for editing the/etc/sudoers file is with visudo. Visudo opens the /etc/sudoers file with the default text editor, and warns you if you save code with errors. Visudo reads the SUDO_EDITOR, VISUAL and EDITOR variables,

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The bash !$ trick: Insert the last argument of the previous command in the current command

The !$ trick works on bash, csh, tcsh and zsh, but does not work on ksh. The !$ trick is very usefull in the Linux and Unix shells. In the Bash shell, the !$ inserts (and expands) the last used

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Just another “Unix and Linux shells” article

Traditionally, the default shell in the Unix systems is dash, for both the users and the system scripts. On GNU / Linux distros, bash has always been the default shell. Some new GNU / Linux distros use dash  as the

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How to set a new PATH in bash, ksh and zsh

The PATH is an environment variable that tells the shell where to look for the basic executables (commands) you use (such as ping, useradd, etc). Setting a new PATH depends on the shell, not on the Linux or Unix distro.

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