In order to print the leading zeros to a variable you need to use the function printf as follows, where %03d states that the number should consist of minimum 3 digits and thus it will put the missing leading zeros:
printf %03d $counter
The following example renames a file that it has the following format for a filename: number.anything and adds the leading zeros in order to make it easier while sorting multiple files.
The name is contained in the variable $a.
If for example we had the file 11.txt it will become 0011.txt
Lets say you have a ton of pictures or photos that you want to resize and add a semi-transparent label at the bottom of this bulk of files and even rename them using a pattern based on a unique number. You can either do this manually or by using imagemagick.…
The following awk script allowed us to switch position of all characters placed in odd numbered positions with their next neighboring even numbered position characters. In detail what it does is to create a for loop that skips one character every time and then it prints each pair in reverse…
In this post we will describe a way to print the last N number of columns in awk. We will use this code as example, where we will print the last 2 columns only: In the awk script we use the variable n to control how many columns we want…
