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the argument for a while loop can be any boolean expression. general break statement inside the while loop is as follows: while [ condition ] do statements1 #executed as long as condition is true and/or, up to a disaster-condition if any. statements2 if (condition) then continue #go to next iteration of i in the loop and skip statements3 fi statements3 done the author is the creator of nixcraft and a seasoned sysadmin, devops engineer, and a trainer for the linux operating system/unix shell scripting.
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the bash while loop is a control flow statement that allows code or commands to be executed repeatedly based on a given condition. for example, run echo command 5 times or read text file line by line or evaluate the options passed on the command line for a script. here is an example for the impatient: #!/bin/bash # this script opens 4 terminal windows. i=”0″ while [ $i -lt 4 ] do xterm this tutorial covers the basics of while loops in bash. in the example below, on each iteration, the current value of the variable i is printed and incremented by one. i=0 while [ $i -le 2 ] , bash while loop one line, bash while loop one line, bash loop one line, bash while loop break, bash for loop. how do you write a while loop in bash? do loops bash script? how do you write a loop in shell script?
a read-while loop is a variation of the above, but is safer for reading lines from a for example, the following snippet: bash loops are very useful. in this section of our bash scripting tutorial we’ll look at while loops, until loops and for loops with plenty of sample code. bash – while loop example. for example, the following loop will be executed 5 times and terminated , bash while variable, bash while not, bash while not, bash sleep, bash while read
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