tcpdump-examples/bash-for-loop.md

## bash-for-loop.md

      
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              bash-for-loop.md
            
          
    This type of for loop is characterized by counting. The range is specified by a beginning (#1) and ending number (#5). The for loop executes a sequence of commands for each member in a list of items. A representative example in BASH is as follows to display welcome message 5 times with for loop:

#!/bin/bash
for i in 1 2 3 4 5
do
   echo "Welcome $i times"
done


Sometimes you may need to set a step value (allowing one to count by two’s or to count backwards for instance). Latest bash version 3.0+ has inbuilt support for setting up ranges:
#!/bin/bash
for i in {1..5}
do
   echo "Welcome $i times"
done

This is from   Bash For Loop Examples In Linux
Bash v4.0+ has inbuilt support for setting up a step value using {START..END..INCREMENT} syntax:
#!/bin/bash
echo "Bash version ${BASH_VERSION}..."
for i in {0..10..2}
  do 
     echo "Welcome $i times"
 done


Sample outputs:
Bash version 4.0.33(0)-release...
Welcome 0 times
Welcome 2 times
Welcome 4 times
Welcome 6 times
Welcome 8 times
Welcome 10 times