The patterns are checked in order until a match is found if none is found, nothing happens.Īlso, refer to our earlier 15 bash array examples article. If there are several patterns separated by pipe characters, the expression can match any of them in order for the associated statements to be run. $ cat yorno.shĮcho -n "Do you agree with this? : "Įcho "Not agreed, you can't proceed the installation"
#Postgresql case statement code
The following code snippet is one of the way to get the yes or no input from user.
#Postgresql case statement software
In most of the software installation, during license agreement, it will ask yes or no input from user. This example prints type of a file (text, Csource, etc) based on the extension of the filename. fileop.sh -d Vim textĪlso, refer to our earlier article on Bash ~ expansaion and expansion. After deleting the lines matches with the pattern Vim: $. It is the most popular editor amongst Linux Journal readers.īash case regex output. The name "Vim" is an acronym for "Vi IMproved" because Vim was created as an extended version of the vi editor, with many additional features designed to be helpful in editing program source code.Īlthough Vim was originally released for the Amiga, Vim has since been developed to be cross-platform, supporting many other platforms. Vim is a text editor released by Bram Moolenaar in 1991 for the Amiga computer. d) echo "After deleting the lines matches with the pattern $2 :"Įxecution of the above script is shown below. # Delete all the lines matches with the pattern p) echo "Lines matches with the pattern $2 :" c) echo "Number of words matches with the pattern $2 :" i) echo "Number of lines matches with the pattern $2 :" $ cat fileop.shĮcho "Usage : $0 option pattern filename"Įcho "Filename given \"$3\" doesn't exist" This example prints the number of lines,number of words and delete the lines that matches the given pattern. $ sleep 1000Īlso, refer to our earlier kill article – 4 methods to kill a process. Usage of the above shell script: Find out the process id of the sleep command and send kill signal to that process id to kill the process. The optional last comparison *) is a default case and that matches anything.It executes the sleep command for a number of seconds.Using kill command, it sends the corresponding signal to the given process id.$1 and $2 are the signal number and process id respectively.*) echo "Signal number $1 is not processed" This script is to demonstrate the usage of the case statement. The following script accepts the signal number and process id as it’s arguments, and sends the signal to a given process id using signal name. If there is no match, exit status of case is zero.īash Case Example 1.
After the first match, case terminates with the exit status of the last command that was executed.When a match is found all of the associated statements until the double semicolon ( ) are executed.Case statement first expands the expression and tries to match it against each pattern.
case expression inįollowing are the key points of bash case statements: Bash case statement is the simplest form of the bash if-then-else statement. The case construct in bash shell allows us to test strings against patterns that can contain wild card characters. In this article let us review the bash case command with 5 practical examples. Instead, bash shell checks the condition, and controls the flow of the program. It can be used to test simple values like integers and characters.Ĭase statement is not a loop, it doesn’t execute a block of code for n number of times. Bash shell case statement is similar to switch statement in C.