# Update the counter file by incrementing the number it contains. perl -i -ple'++$_'counter break# valid input received, exit the loop ;; 'out') # Update the counter file by decrementing the number it contains. perl -i -ple'--$_'counter break# valid input received, exit the loop ...
If we execute the script, the counter will have the value of five: $ ./counter.sh The value of the counter is COUNTER=5 Great, our counter works! 4. The Subshell Pitfall We’ve seen how to create a counter and increment its value in aforloop. So far, so good. When we read the...
In this section, I will be sharing examples of both incrementing and decrementing a variable. Here, I will be using double parentheses syntax for the increment example whereas let command for decrement. Incrementing a variable: In this example, I have used an until loop which will increment t...
Using the += and -= Counter Operators Examples of the use of these operators are as follows: for increment: num=$((num+=1)) ((num+=1)) let "num+=1" for decrement: num=$((num-=1)) ((num-=1)) let "num-=1" Bash example for the += and -= counter operators in a while...
# increment counter for each matched dept. case $DEPT in Accounts) ACC_LOOP=`expr $ACC_LOOP + 1` ACC="Accounts" ;; Customer) CUS_LOOP=`expr $CUS_LOOP + 1` CUS="Customer" ;; Payroll) PAY_LOOP=`expr $PAY_LOOP + 1` PAY="Payroll" ...
A‘while’ loop will continue to execute as long as the condition in the loop remains true. When working with arrays, you can use a counter and increment it in each iteration until you’ve gone through all the elements. Here’s an example: ...
A counter variable is used in the script to print the argument number with the argument value.#!/bin/bash #Initialize a counter counter=1; #Iterate the read argument values for val in "$@" do #Print each argument value echo "Argument $counter: $val"; #Increment the counter ((counter...
# Endless loop example with an endless counter increment [me@linux ~]$ for (( x=0 ; ; x++ )); do echo "\$x=$x"; done $x=0 $x=1 $x=2 ... The While loop The bash while-loop construct can be used to create a condition-controlled loop using a bash conditional expression,...
First, you need to initialize the counter variable as follows: let "errorCounter = 0" Then, issue the line command and capture the return code using the $? variable. If the return code is different than 0, then increment the counter by one (see the statement in bold blue): ...
The database contains a table called captures with seven columns. id: incrementing counter of table entries latitude and longitude: GPS coordinates of the handshake (if available) bssid: MAC address of the access point essid: Name identifier pmkid: WPA PMKID, if captured psk: WPA Passphrase, ...