This example is used to wait till the machine comes up before doing a ssh to that machine. In this example condition is size of the file greater than 2000 bytes, so it copies the file once it reaches the 2000 bytes.Īlso, make sure to refer to our earlier Bash Array examples. The until statement continues to execute the body of the loop, till the condition becomes true. # cat zip_unzip.shįor file in `find /root -name "*.zip*" -type f`ĭirname=`echo $') -gt 2000 ]
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The following example finds the list of files which matches with “*.zip*” in the root directory, and creates a new directory in the same location where the zip file exists, and unzip the zip file content. If list is missing in the for statement, then it takes the positional parameter that were passed into the shell. This list can be a variable that contains several words separated by spaces. This varname can be processed in the body of the loop. The current item from the list will be stored in a variable “varname” each time through the loop. In this form, the for statement executes the command enclosed in a body, once for each item in the list. List is any list which has list of items.The first form of bash for loop is: for varname in list Bash For Loop – First Methodįor loops are typically used when the number of iterations is known before entering the bash loop. Like any other programming language, bash also supports break statement to exit the current loop, and continue statement to resume the next iteration of the loop statement. This article is part of the on-going Bash Tutorial series. In this article let us review the looping statements which bash provides using some examples.īash supports following three types of looping statement The shell language also provide several iteration or looping statements. The controlling expression may be any scalar data type. Loops execute until the value of a controlling expression is 0. The executed statement is called the loop body. Looping statements are used to force a program to repeatedly execute a statement.
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