In Linux if we want to repeat an execution there is a simple way to do this.
First we have the seq command that with the following structure:
and it will output all numbers from 1 to the <number> ( with difference of 1 between number to the next one), every number with its own line.
for example seq 10 will give us all number from 1 to 10
$ seq 5 1 2 3 4 5
if we give seq two arguments, then the first one will be the first number (default 1) and the second will be the last number.
for example to count from 5 to 10:
bob@vmUbuntu:~$ seq 5 10 5 6 7 8 9 10
if we give seq 3 arguments, then the first is the first number (from it the counting start), second the size of the step (between 1 number and the next one) and the third is the last number that close the number list.
For example to count from 2 to 8 with step of size 2:
bob@vmUbuntu:~$ seq 2 2 8 2 4 6 8
As itself it may not look very useful but we can combine it with for loop to repeat actions number of times:
The structure of the for loop
for <variableName> in <list of values separate by spaces or new line>; do list of commands to execute, $variableName is accessible here done
In the below example we have for loop that run from 1 to 10 and display 10 lines, each line the word “number” follow by the number.
$ for num in $(seq 10); do > echo "number $num" > done number 1 number 2 number 3 number 4 number 5 number 6 number 7 number 8 number 9 number 10