What does exclamation do in bash?

What does exclamation do in bash?

Bash uses exclamation marks for history expansions, as explained in the answers to this question (e.g. sudo !! runs the previous command-line with sudo ).

What is exclamation mark in Vim?

to force some action
The exclamation point usually means to force some action. However, there are many other uses, e.g. ! followed by some command executes that command directly from the editor, e.g. :! ls /etc.

What is the difference between W and W in Vim?

W is like the industrial-strength next-word command, words are only delimited by whitespace, be it tab, space or newline. w stops at the delimiting punctuation also, in case you want to deal with that. With w , you stop on each part of the hostname and the dots. W just skips the entire hostname and goes onto the # .

What information does git status show?

The git status command displays the state of the working directory and the staging area. It lets you see which changes have been staged, which haven’t, and which files aren’t being tracked by Git. Status output does not show you any information regarding the committed project history.

Where do you use the exclamation mark in Bash?

I cannot figure out where the exclamation mark is used, what does it represent in terms of actions taken by bash, and where to use it. From the documentation I do not see an explanation that is ‘tangible’.

What do make and O in a makefile mean?

You could write one make rule for each of them, or you could write one rule for all of them: This rule means: if you have a make target (say program) and a .c file with the same basename (program.c), you can compile the .c file using gcc, giving the -o option with the name of the target (gcc -o program program.c).

What does make ( 1 ) mean in Bash syntax?

The make (1) syntax is the use of an action starting with @, which is simply not to echo the command. So a rule like Now, the action part of a rule can be any shell command, including :. Bash help explains this as well as anywhere: $ help : :: : Null command. No effect; the command does nothing.