Can you give examples for uses of. Here are all the environment variables set by the shell Mean in shell programming?true echo $
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# echoes 0 false echo $
# echoes 1 from the manual
(acessible by calling man bash in your shell) Expands to the exit status of the most recently executed foreground pipeline Learn more about exit statuses on wikipedia I often come across $?, $0, $1, $2, etc in shell scripting
Returns the exit status of the last command Echo "this will return 0" But what do the others do There are many shell implementations available, like sh, bash, c shell, z shell, etc.
What is the purpose of && in a shell command
Asked 14 years, 10 months ago modified 2 years, 5 months ago viewed 683k times When going through one shell script, i saw the term $? What is the significance of this term? You'll need to complete a few actions and gain 15 reputation points before being able to upvote
Upvoting indicates when questions and answers are useful What's reputation and how do i get it Instead, you can save this post to reference later. Is the pid of the most recent background command
$0 is the name of the shell or shell script
Most of the above can be found under special parameters in the bash reference manual
