Bookmark and Share

Front Back
What environment variable contains the PID of the running shell? 
What environment variable holds the exit value of the last command? 
What command do you use in the c shell to assign a variable a value? 
What command in the c shell to export variables? 
What command removes a variable from the Bash shell? 
 unset -v
What command removes a function from the Bash shell? 
 unset -f
How do you generate an error for undefined variables? How do you disable this? 
 set -u / set+u
What script is run in Bash once a user logs off? 
What file would allow you to control what certain keystrokes do? 
 /etc/inputrc or ~/.inputrc
Where are aliases/functions typically stored for a user? 
What command would test to determine if a file is not empty? 
 test -s [FILE]
What terminates an if statement? 
What specifies another nested `if` statement if the first statement is false? 
What terminates a case statement? 
What are two ways of performing command substition? 
 $() and ` `
What command allows you to break a loop immediately? 
What command allows you to bypass remaining statements in a command and skip to the next iteration?
How do you source a script to run in the current shell environment?
. [scriptname] or source [scriptname] \\0
What is the syntax used while specifying a shell to use in a script?
Displaying the contents of /etc/shells will show what?
all shells installed on the system \\0
What command will allow you to change your default shell on the fly? 
 chsh [shell] -- this updates /etc/passwd
x of y cards