If you are coming from a C/C++ background, you might be looking for a do-while loop but that one doesn't exist in bash. Check out this answer: What Is the Purpose of the `:' (colon) GNU Bash Builtin? Ici, je fournis une solution différente des solutions précédentes en effectuant une sorte de filtrage. Note the first syntax is recommended as : is part of shell itself i.e.      1  #!/bin/bash Basic syntax of “Bash while loop”: while [ ] do . Open-source project, using Django, Python, jQuery, Git, GitHub, HTML5, Bootstrap from Twitter. Bash is a fully functional scripting language that incorporates Variables, Loops and If/Then statements; the bash shell allows a user to use these functions while performing adhoc tasks via the command line. while(1) - Linux man page Name. A zero exit code is returned. While true. Wouldn't it be better to use: The colon is a built-in command that does nothing, but returns 0 (success). $. #1. Je vais donner un exemple qui peut être utile dans la vie réelle. The while loop reads one line from the file in one iteration and assigned the value to the variable myvar. k=0; Very often in bash scrips you need to ask for user input that requires a Yes or No answer.. For example, you may want to put a quick “Are you sure?” prompt for confirmation before execution of some potentially dangerous part of a bash script.. Typically, the while loop is used when it is impossible to determine the exact number of loop iterations in advance.. read - bash while true . If you have the terminal still open. ; In the end, generally, the increment/decrement of the variable is given. Le compteur vaut : 0 done This question already has an answer here: When you look at how infinite loops should be implemented, you mostly see this approach: But I just don't understand the use of : here. ";done' --assures that the following arguments will be treated as non-option. The argument for a while loop can be any boolean expression.      6          read nbr Thus, it's shorter (and faster) than calling an actual command to do the same thing. How does it work? L’instruction while exécute une instruction ou un bloc d’instructions tant qu’une expression booléenne donne la valeur true.      1  #!/bin/bash ; In the end, generally, the increment/decrement of the variable is given.      7          then 9.6 while (( $j < 10 )) If CONDITION is false on the first time, COMMANDS will not be executed at all. La somme est de : 231 for k in $(seq 1 10); do Thus, it's shorter (and faster) than calling an actual command to do the same thing. Suppose we want a while-loop with no statements in its body. The block of statements are executed until the expression returns true. done. Saisir 53 : 54      5          echo "Le compteur vaut : $cpt" But i need to make all the logs on one line Source file 07/15/2018 17:02:00 TRANSLOG_1700 Server0005_SQL ... (2 Replies) Discussion started by: ranjancom2000. : is a shell builtin command. Le shell propose également la commande interne : qui renvoie toujours vrai et permet donc de faire une boucle infinie avec un while. This might be little tricky. echo "controle"; This is a very useful part to know if a user wants to proceed with the remaining steps for not. $, Le script suivant affiche le compteur tant qu'il est inférieur à 10, $ nl boucleWhile02.sh bash provides the variable $!, which “expands to the process ID of the job most recently placed into the background”, so the following just kills the latest process in the background:. ba&sh présente sa nouvelle collection d'indispensables mode.      2  while : ... single one not loop bash ... Syntax for a single-line Bash infinite while loop do We can use "true" in the expression of a while-loop. Le compteur vaut : 4 This article will help you with examples of (Bash Script – Prompt to Confirm (Y/N, YES/NO)) this type of inputs. $ ./boucleWhile03.sh The key difference between until loop and while loop is in the test condition. Tags HTML autorisés :